diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
index ed3cebf441..47af5b9eb5 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp
@@ -2502,6 +2502,7 @@ static void generate_named_properties_object_declarations(IDL::Interface const&
     generator.append(R"~~~(
 class @named_properties_class@ : public JS::Object {
     JS_OBJECT(@named_properties_class@, JS::Object);
+    JS_DECLARE_ALLOCATOR(@named_properties_class@);
 public:
     explicit @named_properties_class@(JS::Realm&);
     virtual void initialize(JS::Realm&) override;
@@ -3298,7 +3299,7 @@ namespace Web::Bindings {
 
 class @namespace_class@ final : public JS::Object {
     JS_OBJECT(@namespace_class@, JS::Object);
-
+    JS_DECLARE_ALLOCATOR(@namespace_class@);
 public:
     explicit @namespace_class@(JS::Realm&);
     virtual void initialize(JS::Realm&) override;
@@ -3395,6 +3396,8 @@ using namespace Web::WebIDL;
 
 namespace Web::Bindings {
 
+JS_DEFINE_ALLOCATOR(@namespace_class@);
+
 @namespace_class@::@namespace_class@(JS::Realm& realm)
     : Object(ConstructWithoutPrototypeTag::Tag, realm)
 {
@@ -3467,6 +3470,7 @@ namespace Web::Bindings {
 
 class @constructor_class@ : public JS::NativeFunction {
     JS_OBJECT(@constructor_class@, JS::NativeFunction);
+    JS_DECLARE_ALLOCATOR(@constructor_class@);
 public:
     explicit @constructor_class@(JS::Realm&);
     virtual void initialize(JS::Realm&) override;
@@ -3619,6 +3623,8 @@ using namespace Web::WebIDL;
 
 namespace Web::Bindings {
 
+JS_DEFINE_ALLOCATOR(@constructor_class@);
+
 @constructor_class@::@constructor_class@(JS::Realm& realm)
     : NativeFunction("@name@"sv, realm.intrinsics().function_prototype())
 {
@@ -3958,6 +3964,7 @@ namespace Web::Bindings {
 
 class @prototype_class@ : public JS::Object {
     JS_OBJECT(@prototype_class@, JS::Object);
+    JS_DECLARE_ALLOCATOR(@prototype_class@);
 public:
     explicit @prototype_class@(JS::Realm&);
     virtual void initialize(JS::Realm&) override;
@@ -4096,6 +4103,8 @@ using namespace Web::WebIDL;
 
 namespace Web::Bindings {
 
+JS_DEFINE_ALLOCATOR(@prototype_class@);
+
 @prototype_class@::@prototype_class@([[maybe_unused]] JS::Realm& realm))~~~");
     if (interface.name == "DOMException") {
         // https://webidl.spec.whatwg.org/#es-DOMException-specialness
@@ -4168,6 +4177,7 @@ namespace Web::Bindings {
 
 class @prototype_class@ : public JS::Object {
     JS_OBJECT(@prototype_class@, JS::Object);
+    JS_DECLARE_ALLOCATOR(@prototype_class@);
 public:
     explicit @prototype_class@(JS::Realm&);
     virtual void initialize(JS::Realm&) override;
@@ -4241,6 +4251,8 @@ using namespace Web::WebIDL;
 
 namespace Web::Bindings {
 
+JS_DEFINE_ALLOCATOR(@prototype_class@);
+
 @prototype_class@::@prototype_class@(JS::Realm& realm)
     : Object(ConstructWithPrototypeTag::Tag, realm.intrinsics().iterator_prototype())
 {
diff --git a/Userland/Libraries/LibWeb/Animations/Animation.cpp b/Userland/Libraries/LibWeb/Animations/Animation.cpp
index e6b9867f37..76b179d4ee 100644
--- a/Userland/Libraries/LibWeb/Animations/Animation.cpp
+++ b/Userland/Libraries/LibWeb/Animations/Animation.cpp
@@ -17,6 +17,8 @@
 
 namespace Web::Animations {
 
+JS_DEFINE_ALLOCATOR(Animation);
+
 // https://www.w3.org/TR/web-animations-1/#dom-animation-animation
 JS::NonnullGCPtr<Animation> Animation::create(JS::Realm& realm, JS::GCPtr<AnimationEffect> effect, JS::GCPtr<AnimationTimeline> timeline)
 {
diff --git a/Userland/Libraries/LibWeb/Animations/Animation.h b/Userland/Libraries/LibWeb/Animations/Animation.h
index 1611c999eb..12234acc3b 100644
--- a/Userland/Libraries/LibWeb/Animations/Animation.h
+++ b/Userland/Libraries/LibWeb/Animations/Animation.h
@@ -15,6 +15,7 @@ namespace Web::Animations {
 // https://www.w3.org/TR/web-animations-1/#the-animation-interface
 class Animation : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(Animation, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(Animation);
 
 public:
     static JS::NonnullGCPtr<Animation> create(JS::Realm&, JS::GCPtr<AnimationEffect>, JS::GCPtr<AnimationTimeline>);
diff --git a/Userland/Libraries/LibWeb/Animations/AnimationEffect.cpp b/Userland/Libraries/LibWeb/Animations/AnimationEffect.cpp
index 97e35352a7..2c9d67ee87 100644
--- a/Userland/Libraries/LibWeb/Animations/AnimationEffect.cpp
+++ b/Userland/Libraries/LibWeb/Animations/AnimationEffect.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Animations {
 
+JS_DEFINE_ALLOCATOR(AnimationEffect);
+
 JS::NonnullGCPtr<AnimationEffect> AnimationEffect::create(JS::Realm& realm)
 {
     return realm.heap().allocate<AnimationEffect>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/Animations/AnimationEffect.h b/Userland/Libraries/LibWeb/Animations/AnimationEffect.h
index 075b8a8004..6ed78b1ef4 100644
--- a/Userland/Libraries/LibWeb/Animations/AnimationEffect.h
+++ b/Userland/Libraries/LibWeb/Animations/AnimationEffect.h
@@ -58,6 +58,7 @@ enum class AnimationDirection {
 // https://www.w3.org/TR/web-animations-1/#the-animationeffect-interface
 class AnimationEffect : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(AnimationEffect, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(AnimationEffect);
 
 public:
     static JS::NonnullGCPtr<AnimationEffect> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.cpp b/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.cpp
index 21bb7420e2..938f3018d2 100644
--- a/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.cpp
+++ b/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::Animations {
 
+JS_DEFINE_ALLOCATOR(AnimationPlaybackEvent);
+
 JS::NonnullGCPtr<AnimationPlaybackEvent> AnimationPlaybackEvent::create(JS::Realm& realm, FlyString const& event_name, AnimationPlaybackEventInit const& event_init)
 {
     return realm.heap().allocate<AnimationPlaybackEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.h b/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.h
index d9666f172a..08523c599e 100644
--- a/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.h
+++ b/Userland/Libraries/LibWeb/Animations/AnimationPlaybackEvent.h
@@ -20,6 +20,7 @@ struct AnimationPlaybackEventInit : public DOM::EventInit {
 // https://www.w3.org/TR/web-animations-1/#animationplaybackevent
 class AnimationPlaybackEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(AnimationPlaybackEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(AnimationPlaybackEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<AnimationPlaybackEvent> create(JS::Realm&, FlyString const& event_name, AnimationPlaybackEventInit const& event_init = {});
diff --git a/Userland/Libraries/LibWeb/Animations/AnimationTimeline.cpp b/Userland/Libraries/LibWeb/Animations/AnimationTimeline.cpp
index d794f07807..6626891f8b 100644
--- a/Userland/Libraries/LibWeb/Animations/AnimationTimeline.cpp
+++ b/Userland/Libraries/LibWeb/Animations/AnimationTimeline.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Animations {
 
+JS_DEFINE_ALLOCATOR(AnimationTimeline);
+
 WebIDL::ExceptionOr<void> AnimationTimeline::set_current_time(Optional<double> value)
 {
     if (value == m_current_time)
diff --git a/Userland/Libraries/LibWeb/Animations/AnimationTimeline.h b/Userland/Libraries/LibWeb/Animations/AnimationTimeline.h
index 48a34a15c3..fc19243000 100644
--- a/Userland/Libraries/LibWeb/Animations/AnimationTimeline.h
+++ b/Userland/Libraries/LibWeb/Animations/AnimationTimeline.h
@@ -13,6 +13,7 @@ namespace Web::Animations {
 // https://www.w3.org/TR/web-animations-1/#animationtimeline
 class AnimationTimeline : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(AnimationTimeline, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(AnimationTimeline);
 
 public:
     Optional<double> current_time() const { return m_current_time; }
diff --git a/Userland/Libraries/LibWeb/Animations/DocumentTimeline.cpp b/Userland/Libraries/LibWeb/Animations/DocumentTimeline.cpp
index 6484f792c0..6cd27f501d 100644
--- a/Userland/Libraries/LibWeb/Animations/DocumentTimeline.cpp
+++ b/Userland/Libraries/LibWeb/Animations/DocumentTimeline.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::Animations {
 
+JS_DEFINE_ALLOCATOR(DocumentTimeline);
+
 JS::NonnullGCPtr<DocumentTimeline> DocumentTimeline::create(JS::Realm& realm, DOM::Document& document, HighResolutionTime::DOMHighResTimeStamp origin_time)
 {
     return realm.heap().allocate<DocumentTimeline>(realm, realm, document, origin_time);
diff --git a/Userland/Libraries/LibWeb/Animations/DocumentTimeline.h b/Userland/Libraries/LibWeb/Animations/DocumentTimeline.h
index 617ac6efb7..7d03c1479c 100644
--- a/Userland/Libraries/LibWeb/Animations/DocumentTimeline.h
+++ b/Userland/Libraries/LibWeb/Animations/DocumentTimeline.h
@@ -20,6 +20,7 @@ struct DocumentTimelineOptions {
 // https://www.w3.org/TR/web-animations-1/#the-documenttimeline-interface
 class DocumentTimeline : public AnimationTimeline {
     WEB_PLATFORM_OBJECT(DocumentTimeline, AnimationTimeline);
+    JS_DECLARE_ALLOCATOR(DocumentTimeline);
 
 public:
     static JS::NonnullGCPtr<DocumentTimeline> create(JS::Realm&, DOM::Document&, HighResolutionTime::DOMHighResTimeStamp origin_time);
diff --git a/Userland/Libraries/LibWeb/Animations/KeyframeEffect.h b/Userland/Libraries/LibWeb/Animations/KeyframeEffect.h
index 3dd7b34787..a07b6eed43 100644
--- a/Userland/Libraries/LibWeb/Animations/KeyframeEffect.h
+++ b/Userland/Libraries/LibWeb/Animations/KeyframeEffect.h
@@ -39,6 +39,7 @@ struct BaseKeyframe {
 // https://www.w3.org/TR/web-animations-1/#the-keyframeeffect-interface
 class KeyframeEffect : public AnimationEffect {
     WEB_PLATFORM_OBJECT(KeyframeEffect, AnimationEffect);
+    JS_DECLARE_ALLOCATOR(KeyframeEffect);
 
 public:
     static JS::NonnullGCPtr<KeyframeEffect> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp b/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp
index 153cd50180..09cab361e3 100644
--- a/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/Intrinsics.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Bindings {
 
+JS_DEFINE_ALLOCATOR(Intrinsics);
+
 void Intrinsics::visit_edges(JS::Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/Bindings/Intrinsics.h b/Userland/Libraries/LibWeb/Bindings/Intrinsics.h
index 896a143da5..34fa4a3016 100644
--- a/Userland/Libraries/LibWeb/Bindings/Intrinsics.h
+++ b/Userland/Libraries/LibWeb/Bindings/Intrinsics.h
@@ -18,6 +18,7 @@ namespace Web::Bindings {
 
 class Intrinsics final : public JS::Cell {
     JS_CELL(Intrinsics, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Intrinsics);
 
 public:
     Intrinsics(JS::Realm& realm)
diff --git a/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h b/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h
index 6986b3ae99..543b4ed5c6 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h
@@ -14,6 +14,7 @@ namespace Web::CSS {
 
 class CSSFontFaceRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSFontFaceRule, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSFontFaceRule);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSFontFaceRule> create(JS::Realm&, FontFace&&);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp
index 568e2e623b..166605db25 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp
@@ -19,6 +19,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSImportRule);
+
 JS::NonnullGCPtr<CSSImportRule> CSSImportRule::create(AK::URL url, DOM::Document& document)
 {
     auto& realm = document.realm();
diff --git a/Userland/Libraries/LibWeb/CSS/CSSImportRule.h b/Userland/Libraries/LibWeb/CSS/CSSImportRule.h
index 9687ca070e..265f821228 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSImportRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSImportRule.h
@@ -20,6 +20,7 @@ class CSSImportRule final
     : public CSSRule
     , public ResourceClient {
     WEB_PLATFORM_OBJECT(CSSImportRule, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSImportRule);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSImportRule> create(AK::URL, DOM::Document&);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp
index cbeb924583..9e62624a75 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSKeyframeRule);
+
 JS::NonnullGCPtr<CSSKeyframeRule> CSSKeyframeRule::create(JS::Realm& realm, CSS::Percentage key, Web::CSS::CSSStyleDeclaration& declarations)
 {
     return realm.heap().allocate<CSSKeyframeRule>(realm, realm, key, declarations);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h
index 0d1abdff70..e7a007781d 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h
@@ -18,6 +18,7 @@ namespace Web::CSS {
 // https://drafts.csswg.org/css-animations/#interface-csskeyframerule
 class CSSKeyframeRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSKeyframeRule, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSKeyframeRule);
 
 public:
     static JS::NonnullGCPtr<CSSKeyframeRule> create(JS::Realm&, CSS::Percentage key, CSSStyleDeclaration&);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp
index be1485df17..aa27054132 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSKeyframesRule);
+
 JS::NonnullGCPtr<CSSKeyframesRule> CSSKeyframesRule::create(JS::Realm& realm, FlyString name, JS::MarkedVector<JS::NonnullGCPtr<CSSKeyframeRule>> keyframes)
 {
     return realm.heap().allocate<CSSKeyframesRule>(realm, realm, move(name), move(keyframes));
diff --git a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h
index f4e80f7ec4..3ab4899759 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h
@@ -19,6 +19,7 @@ namespace Web::CSS {
 // https://drafts.csswg.org/css-animations/#interface-csskeyframesrule
 class CSSKeyframesRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSKeyframesRule, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSKeyframesRule);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSKeyframesRule> create(JS::Realm&, FlyString name, JS::MarkedVector<JS::NonnullGCPtr<CSSKeyframeRule>>);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp
index 51511acea4..77f71256cf 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSMediaRule);
+
 JS::NonnullGCPtr<CSSMediaRule> CSSMediaRule::create(JS::Realm& realm, MediaList& media_queries, CSSRuleList& rules)
 {
     return realm.heap().allocate<CSSMediaRule>(realm, realm, media_queries, rules);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h
index 80e07fce75..3e110ffef8 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSMediaRule.h
@@ -16,6 +16,7 @@ namespace Web::CSS {
 // https://www.w3.org/TR/css-conditional-3/#the-cssmediarule-interface
 class CSSMediaRule final : public CSSConditionRule {
     WEB_PLATFORM_OBJECT(CSSMediaRule, CSSConditionRule);
+    JS_DECLARE_ALLOCATOR(CSSMediaRule);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSMediaRule> create(JS::Realm&, MediaList& media_queries, CSSRuleList&);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.cpp
index 2eb38d5267..374e2e1957 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSNamespaceRule);
+
 CSSNamespaceRule::CSSNamespaceRule(JS::Realm& realm, Optional<DeprecatedString> prefix, StringView namespace_uri)
     : CSSRule(realm)
     , m_namespace_uri(namespace_uri)
diff --git a/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.h b/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.h
index 42d6adcdb8..a667fc1af5 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.h
@@ -12,6 +12,7 @@ namespace Web::CSS {
 
 class CSSNamespaceRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSNamespaceRule, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSNamespaceRule);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSNamespaceRule> create(JS::Realm&, Optional<DeprecatedString> prefix, StringView namespace_uri);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp b/Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp
index cf86402475..601ed4865f 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSRuleList);
+
 JS::NonnullGCPtr<CSSRuleList> CSSRuleList::create(JS::Realm& realm, JS::MarkedVector<CSSRule*> const& rules)
 {
     auto rule_list = realm.heap().allocate<CSSRuleList>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSRuleList.h b/Userland/Libraries/LibWeb/CSS/CSSRuleList.h
index 455a9de93c..0955008fe1 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSRuleList.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSRuleList.h
@@ -21,6 +21,7 @@ namespace Web::CSS {
 // https://www.w3.org/TR/cssom/#the-cssrulelist-interface
 class CSSRuleList : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(CSSRuleList, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(CSSRuleList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSRuleList> create(JS::Realm&, JS::MarkedVector<CSSRule*> const&);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
index 6b2f075b24..6701378036 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp
@@ -16,6 +16,10 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSStyleDeclaration);
+JS_DEFINE_ALLOCATOR(PropertyOwningCSSStyleDeclaration);
+JS_DEFINE_ALLOCATOR(ElementInlineCSSStyleDeclaration);
+
 CSSStyleDeclaration::CSSStyleDeclaration(JS::Realm& realm)
     : PlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
index e03474272c..33423c0ce3 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h
@@ -16,6 +16,7 @@ namespace Web::CSS {
 
 class CSSStyleDeclaration : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(CSSStyleDeclaration, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(CSSStyleDeclaration);
 
 public:
     virtual ~CSSStyleDeclaration() = default;
@@ -50,6 +51,8 @@ protected:
 
 class PropertyOwningCSSStyleDeclaration : public CSSStyleDeclaration {
     WEB_PLATFORM_OBJECT(PropertyOwningCSSStyleDeclaration, CSSStyleDeclaration);
+    JS_DECLARE_ALLOCATOR(PropertyOwningCSSStyleDeclaration);
+
     friend class ElementInlineCSSStyleDeclaration;
 
 public:
@@ -93,6 +96,7 @@ private:
 
 class ElementInlineCSSStyleDeclaration final : public PropertyOwningCSSStyleDeclaration {
     WEB_PLATFORM_OBJECT(ElementInlineCSSStyleDeclaration, PropertyOwningCSSStyleDeclaration);
+    JS_DECLARE_ALLOCATOR(ElementInlineCSSStyleDeclaration);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ElementInlineCSSStyleDeclaration> create(DOM::Element&, Vector<StyleProperty>, HashMap<FlyString, StyleProperty> custom_properties);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp
index ca57886c8f..ef8a9a2f37 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSStyleRule);
+
 JS::NonnullGCPtr<CSSStyleRule> CSSStyleRule::create(JS::Realm& realm, Vector<NonnullRefPtr<Web::CSS::Selector>>&& selectors, CSSStyleDeclaration& declaration)
 {
     return realm.heap().allocate<CSSStyleRule>(realm, realm, move(selectors), declaration);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleRule.h b/Userland/Libraries/LibWeb/CSS/CSSStyleRule.h
index 0a9c57054a..76386bb719 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleRule.h
@@ -16,6 +16,7 @@ namespace Web::CSS {
 
 class CSSStyleRule final : public CSSRule {
     WEB_PLATFORM_OBJECT(CSSStyleRule, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSStyleRule);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSStyleRule> create(JS::Realm&, Vector<NonnullRefPtr<Selector>>&&, CSSStyleDeclaration&);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
index c7eaec44f6..4da64b356c 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSStyleSheet);
+
 JS::NonnullGCPtr<CSSStyleSheet> CSSStyleSheet::create(JS::Realm& realm, CSSRuleList& rules, MediaList& media, Optional<AK::URL> location)
 {
     return realm.heap().allocate<CSSStyleSheet>(realm, realm, rules, media, move(location));
diff --git a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
index 9b30c87849..9c4cc71eed 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h
@@ -21,6 +21,7 @@ class CSSStyleSheet final
     : public StyleSheet
     , public Weakable<CSSStyleSheet> {
     WEB_PLATFORM_OBJECT(CSSStyleSheet, StyleSheet);
+    JS_DECLARE_ALLOCATOR(CSSStyleSheet);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CSSStyleSheet> create(JS::Realm&, CSSRuleList&, MediaList&, Optional<AK::URL> location);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp b/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp
index 80b8ee9b07..3979118a26 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp
+++ b/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(CSSSupportsRule);
+
 JS::NonnullGCPtr<CSSSupportsRule> CSSSupportsRule::create(JS::Realm& realm, NonnullRefPtr<Supports>&& supports, CSSRuleList& rules)
 {
     return realm.heap().allocate<CSSSupportsRule>(realm, realm, move(supports), rules);
diff --git a/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h b/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h
index a5e195cb15..f3e59dd83a 100644
--- a/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h
+++ b/Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h
@@ -17,6 +17,7 @@ namespace Web::CSS {
 // https://www.w3.org/TR/css-conditional-3/#the-csssupportsrule-interface
 class CSSSupportsRule final : public CSSConditionRule {
     WEB_PLATFORM_OBJECT(CSSSupportsRule, CSSConditionRule);
+    JS_DECLARE_ALLOCATOR(CSSSupportsRule);
 
 public:
     static JS::NonnullGCPtr<CSSSupportsRule> create(JS::Realm&, NonnullRefPtr<Supports>&&, CSSRuleList&);
diff --git a/Userland/Libraries/LibWeb/CSS/MediaList.cpp b/Userland/Libraries/LibWeb/CSS/MediaList.cpp
index 7deb563cc9..acb2e9bd7c 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaList.cpp
+++ b/Userland/Libraries/LibWeb/CSS/MediaList.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(MediaList);
+
 JS::NonnullGCPtr<MediaList> MediaList::create(JS::Realm& realm, Vector<NonnullRefPtr<MediaQuery>>&& media)
 {
     return realm.heap().allocate<MediaList>(realm, realm, move(media));
diff --git a/Userland/Libraries/LibWeb/CSS/MediaList.h b/Userland/Libraries/LibWeb/CSS/MediaList.h
index d5f0a027c1..454304706d 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaList.h
+++ b/Userland/Libraries/LibWeb/CSS/MediaList.h
@@ -18,6 +18,7 @@ namespace Web::CSS {
 // https://www.w3.org/TR/cssom-1/#the-medialist-interface
 class MediaList final : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(MediaList, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(MediaList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MediaList> create(JS::Realm&, Vector<NonnullRefPtr<MediaQuery>>&&);
diff --git a/Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp b/Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp
index 0b3cf39c81..af67ba2745 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp
+++ b/Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(MediaQueryList);
+
 JS::NonnullGCPtr<MediaQueryList> MediaQueryList::create(DOM::Document& document, Vector<NonnullRefPtr<MediaQuery>>&& media)
 {
     return document.heap().allocate<MediaQueryList>(document.realm(), document, move(media));
diff --git a/Userland/Libraries/LibWeb/CSS/MediaQueryList.h b/Userland/Libraries/LibWeb/CSS/MediaQueryList.h
index d554adf31a..b82a471486 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaQueryList.h
+++ b/Userland/Libraries/LibWeb/CSS/MediaQueryList.h
@@ -15,6 +15,7 @@ namespace Web::CSS {
 // 4.2. The MediaQueryList Interface, https://drafts.csswg.org/cssom-view/#the-mediaquerylist-interface
 class MediaQueryList final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(MediaQueryList, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(MediaQueryList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MediaQueryList> create(DOM::Document&, Vector<NonnullRefPtr<MediaQuery>>&&);
diff --git a/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.cpp b/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.cpp
index 137092c4e5..36d618fd8a 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.cpp
+++ b/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(MediaQueryListEvent);
+
 JS::NonnullGCPtr<MediaQueryListEvent> MediaQueryListEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, MediaQueryListEventInit const& event_init)
 {
     return realm.heap().allocate<MediaQueryListEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.h b/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.h
index 3dcb7ac41e..0898a62d2c 100644
--- a/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.h
+++ b/Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.h
@@ -18,6 +18,7 @@ struct MediaQueryListEventInit : public DOM::EventInit {
 
 class MediaQueryListEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(MediaQueryListEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(MediaQueryListEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MediaQueryListEvent> construct_impl(JS::Realm&, FlyString const& event_name, MediaQueryListEventInit const& = {});
diff --git a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
index fa5816286e..e6eb36754e 100644
--- a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
+++ b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
@@ -44,6 +44,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(ResolvedCSSStyleDeclaration);
+
 JS::NonnullGCPtr<ResolvedCSSStyleDeclaration> ResolvedCSSStyleDeclaration::create(DOM::Element& element)
 {
     return element.realm().heap().allocate<ResolvedCSSStyleDeclaration>(element.realm(), element);
diff --git a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h
index 6b3d8c5222..f736277a64 100644
--- a/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h
+++ b/Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.h
@@ -12,6 +12,7 @@ namespace Web::CSS {
 
 class ResolvedCSSStyleDeclaration final : public CSSStyleDeclaration {
     WEB_PLATFORM_OBJECT(ResolvedCSSStyleDeclaration, CSSStyleDeclaration);
+    JS_DECLARE_ALLOCATOR(ResolvedCSSStyleDeclaration);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ResolvedCSSStyleDeclaration> create(DOM::Element&);
diff --git a/Userland/Libraries/LibWeb/CSS/Screen.cpp b/Userland/Libraries/LibWeb/CSS/Screen.cpp
index 2797026faf..8c84ecacd2 100644
--- a/Userland/Libraries/LibWeb/CSS/Screen.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Screen.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(Screen);
+
 JS::NonnullGCPtr<Screen> Screen::create(HTML::Window& window)
 {
     return window.heap().allocate<Screen>(window.realm(), window);
diff --git a/Userland/Libraries/LibWeb/CSS/Screen.h b/Userland/Libraries/LibWeb/CSS/Screen.h
index a416576e46..8fa0a8e0c1 100644
--- a/Userland/Libraries/LibWeb/CSS/Screen.h
+++ b/Userland/Libraries/LibWeb/CSS/Screen.h
@@ -15,6 +15,7 @@ namespace Web::CSS {
 
 class Screen final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Screen, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Screen);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Screen> create(HTML::Window&);
diff --git a/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp b/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp
index d61807cdd8..33e711bed4 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp
+++ b/Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(StyleSheetList);
+
 void StyleSheetList::add_sheet(CSSStyleSheet& sheet)
 {
     sheet.set_style_sheet_list({}, this);
diff --git a/Userland/Libraries/LibWeb/CSS/StyleSheetList.h b/Userland/Libraries/LibWeb/CSS/StyleSheetList.h
index 5cdc22d7f7..a6ebfcce24 100644
--- a/Userland/Libraries/LibWeb/CSS/StyleSheetList.h
+++ b/Userland/Libraries/LibWeb/CSS/StyleSheetList.h
@@ -12,8 +12,9 @@
 
 namespace Web::CSS {
 
-class StyleSheetList : public Bindings::LegacyPlatformObject {
+class StyleSheetList final : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(StyleSheetList, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(StyleSheetList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<StyleSheetList> create(DOM::Document&);
diff --git a/Userland/Libraries/LibWeb/CSS/VisualViewport.cpp b/Userland/Libraries/LibWeb/CSS/VisualViewport.cpp
index 7089f4055c..2001e79270 100644
--- a/Userland/Libraries/LibWeb/CSS/VisualViewport.cpp
+++ b/Userland/Libraries/LibWeb/CSS/VisualViewport.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::CSS {
 
+JS_DEFINE_ALLOCATOR(VisualViewport);
+
 JS::NonnullGCPtr<VisualViewport> VisualViewport::create(DOM::Document& document)
 {
     return document.heap().allocate<VisualViewport>(document.realm(), document);
diff --git a/Userland/Libraries/LibWeb/CSS/VisualViewport.h b/Userland/Libraries/LibWeb/CSS/VisualViewport.h
index c471bb7fe4..e22766cfe0 100644
--- a/Userland/Libraries/LibWeb/CSS/VisualViewport.h
+++ b/Userland/Libraries/LibWeb/CSS/VisualViewport.h
@@ -13,6 +13,7 @@ namespace Web::CSS {
 // https://drafts.csswg.org/cssom-view/#visualviewport
 class VisualViewport final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(VisualViewport, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(VisualViewport);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<VisualViewport> create(DOM::Document&);
diff --git a/Userland/Libraries/LibWeb/Clipboard/Clipboard.cpp b/Userland/Libraries/LibWeb/Clipboard/Clipboard.cpp
index 8a07fbeb4f..5c0c1b0879 100644
--- a/Userland/Libraries/LibWeb/Clipboard/Clipboard.cpp
+++ b/Userland/Libraries/LibWeb/Clipboard/Clipboard.cpp
@@ -19,6 +19,8 @@
 
 namespace Web::Clipboard {
 
+JS_DEFINE_ALLOCATOR(Clipboard);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Clipboard>> Clipboard::construct_impl(JS::Realm& realm)
 {
     return realm.heap().allocate<Clipboard>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/Clipboard/Clipboard.h b/Userland/Libraries/LibWeb/Clipboard/Clipboard.h
index 21553d61b3..761379e487 100644
--- a/Userland/Libraries/LibWeb/Clipboard/Clipboard.h
+++ b/Userland/Libraries/LibWeb/Clipboard/Clipboard.h
@@ -17,6 +17,7 @@ namespace Web::Clipboard {
 
 class Clipboard final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(Clipboard, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(Clipboard);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Clipboard>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Crypto/Crypto.cpp b/Userland/Libraries/LibWeb/Crypto/Crypto.cpp
index 43d7476dd8..0779adbdce 100644
--- a/Userland/Libraries/LibWeb/Crypto/Crypto.cpp
+++ b/Userland/Libraries/LibWeb/Crypto/Crypto.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::Crypto {
 
+JS_DEFINE_ALLOCATOR(Crypto);
+
 JS::NonnullGCPtr<Crypto> Crypto::create(JS::Realm& realm)
 {
     return realm.heap().allocate<Crypto>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/Crypto/Crypto.h b/Userland/Libraries/LibWeb/Crypto/Crypto.h
index bfb6fb3440..76b6eaad8a 100644
--- a/Userland/Libraries/LibWeb/Crypto/Crypto.h
+++ b/Userland/Libraries/LibWeb/Crypto/Crypto.h
@@ -14,6 +14,7 @@ namespace Web::Crypto {
 
 class Crypto : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Crypto, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Crypto);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Crypto> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp b/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
index 4eb7aa24f9..442e176afc 100644
--- a/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
+++ b/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::Crypto {
 
+JS_DEFINE_ALLOCATOR(SubtleCrypto);
+
 JS::NonnullGCPtr<SubtleCrypto> SubtleCrypto::create(JS::Realm& realm)
 {
     return realm.heap().allocate<SubtleCrypto>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.h b/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.h
index 42203505cc..886e9327e8 100644
--- a/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.h
+++ b/Userland/Libraries/LibWeb/Crypto/SubtleCrypto.h
@@ -13,6 +13,7 @@ namespace Web::Crypto {
 
 class SubtleCrypto final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(SubtleCrypto, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(SubtleCrypto);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<SubtleCrypto> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/DOM/AbortController.cpp b/Userland/Libraries/LibWeb/DOM/AbortController.cpp
index b767dacabb..61b387dcd8 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortController.cpp
+++ b/Userland/Libraries/LibWeb/DOM/AbortController.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(AbortController);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<AbortController>> AbortController::construct_impl(JS::Realm& realm)
 {
     auto signal = TRY(AbortSignal::construct_impl(realm));
diff --git a/Userland/Libraries/LibWeb/DOM/AbortController.h b/Userland/Libraries/LibWeb/DOM/AbortController.h
index 9f1944fe43..76ffbadf8a 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortController.h
+++ b/Userland/Libraries/LibWeb/DOM/AbortController.h
@@ -14,6 +14,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#abortcontroller
 class AbortController final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(AbortController, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(AbortController);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<AbortController>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp b/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
index ceb8fe88f0..009dc044f4 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
+++ b/Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(AbortSignal);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<AbortSignal>> AbortSignal::construct_impl(JS::Realm& realm)
 {
     return realm.heap().allocate<AbortSignal>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/DOM/AbortSignal.h b/Userland/Libraries/LibWeb/DOM/AbortSignal.h
index 79a40a2b2d..4abdb94a57 100644
--- a/Userland/Libraries/LibWeb/DOM/AbortSignal.h
+++ b/Userland/Libraries/LibWeb/DOM/AbortSignal.h
@@ -17,6 +17,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#abortsignal
 class AbortSignal final : public EventTarget {
     WEB_PLATFORM_OBJECT(AbortSignal, EventTarget);
+    JS_DECLARE_ALLOCATOR(AbortSignal);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<AbortSignal>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.cpp b/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.cpp
index 1cef74149b..61cc30a36f 100644
--- a/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.cpp
+++ b/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(AccessibilityTreeNode);
+
 JS::NonnullGCPtr<AccessibilityTreeNode> AccessibilityTreeNode::create(Document* document, DOM::Node const* value)
 {
     return document->heap().allocate<AccessibilityTreeNode>(document->realm(), value);
diff --git a/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.h b/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.h
index 9b7301b3c8..123eadfbc8 100644
--- a/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.h
+++ b/Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.h
@@ -9,13 +9,16 @@
 #include <AK/JsonObjectSerializer.h>
 #include <AK/Vector.h>
 #include <LibJS/Heap/Cell.h>
+#include <LibJS/Heap/CellAllocator.h>
 #include <LibWeb/DOM/Node.h>
 #include <LibWeb/Forward.h>
 
 namespace Web::DOM {
 
 class AccessibilityTreeNode final : public JS::Cell {
-    JS_CELL(AccessibilityTreeNode, JS::Cell)
+    JS_CELL(AccessibilityTreeNode, JS::Cell);
+    JS_DECLARE_ALLOCATOR(AccessibilityTreeNode);
+
 public:
     static JS::NonnullGCPtr<AccessibilityTreeNode> create(Document*, DOM::Node const*);
     virtual ~AccessibilityTreeNode() override = default;
diff --git a/Userland/Libraries/LibWeb/DOM/Attr.cpp b/Userland/Libraries/LibWeb/DOM/Attr.cpp
index d9654e59b9..a9ae2e9bbd 100644
--- a/Userland/Libraries/LibWeb/DOM/Attr.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Attr.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Attr);
+
 JS::NonnullGCPtr<Attr> Attr::create(Document& document, FlyString local_name, String value, Element* owner_element)
 {
     return document.heap().allocate<Attr>(document.realm(), document, QualifiedName(move(local_name), Optional<FlyString> {}, Optional<FlyString> {}), move(value), owner_element);
diff --git a/Userland/Libraries/LibWeb/DOM/Attr.h b/Userland/Libraries/LibWeb/DOM/Attr.h
index 5375996de2..458ff29346 100644
--- a/Userland/Libraries/LibWeb/DOM/Attr.h
+++ b/Userland/Libraries/LibWeb/DOM/Attr.h
@@ -15,6 +15,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#attr
 class Attr final : public Node {
     WEB_PLATFORM_OBJECT(Attr, Node);
+    JS_DECLARE_ALLOCATOR(Attr);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Attr> create(Document&, QualifiedName, String value = {}, Element* = nullptr);
diff --git a/Userland/Libraries/LibWeb/DOM/CDATASection.cpp b/Userland/Libraries/LibWeb/DOM/CDATASection.cpp
index f48255ae2d..d65f5ead0e 100644
--- a/Userland/Libraries/LibWeb/DOM/CDATASection.cpp
+++ b/Userland/Libraries/LibWeb/DOM/CDATASection.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(CDATASection);
+
 CDATASection::CDATASection(Document& document, String const& data)
     : Text(document, NodeType::CDATA_SECTION_NODE, data)
 {
diff --git a/Userland/Libraries/LibWeb/DOM/CDATASection.h b/Userland/Libraries/LibWeb/DOM/CDATASection.h
index b2d831344a..4279570f17 100644
--- a/Userland/Libraries/LibWeb/DOM/CDATASection.h
+++ b/Userland/Libraries/LibWeb/DOM/CDATASection.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 
 class CDATASection final : public Text {
     WEB_PLATFORM_OBJECT(CDATASection, Text);
+    JS_DECLARE_ALLOCATOR(CDATASection);
 
 public:
     virtual ~CDATASection() override;
diff --git a/Userland/Libraries/LibWeb/DOM/CharacterData.cpp b/Userland/Libraries/LibWeb/DOM/CharacterData.cpp
index 4c3ceeda61..050d3e365b 100644
--- a/Userland/Libraries/LibWeb/DOM/CharacterData.cpp
+++ b/Userland/Libraries/LibWeb/DOM/CharacterData.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(CharacterData);
+
 CharacterData::CharacterData(Document& document, NodeType type, String const& data)
     : Node(document, type)
     , m_data(data)
diff --git a/Userland/Libraries/LibWeb/DOM/CharacterData.h b/Userland/Libraries/LibWeb/DOM/CharacterData.h
index 491065e5d0..2897adeb2b 100644
--- a/Userland/Libraries/LibWeb/DOM/CharacterData.h
+++ b/Userland/Libraries/LibWeb/DOM/CharacterData.h
@@ -18,6 +18,7 @@ class CharacterData
     , public ChildNode<CharacterData>
     , public NonDocumentTypeChildNode<CharacterData> {
     WEB_PLATFORM_OBJECT(CharacterData, Node);
+    JS_DECLARE_ALLOCATOR(CharacterData);
 
 public:
     virtual ~CharacterData() override = default;
diff --git a/Userland/Libraries/LibWeb/DOM/Comment.cpp b/Userland/Libraries/LibWeb/DOM/Comment.cpp
index a0f36e965b..0e67656729 100644
--- a/Userland/Libraries/LibWeb/DOM/Comment.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Comment.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Comment);
+
 Comment::Comment(Document& document, String const& data)
     : CharacterData(document, NodeType::COMMENT_NODE, data)
 {
diff --git a/Userland/Libraries/LibWeb/DOM/Comment.h b/Userland/Libraries/LibWeb/DOM/Comment.h
index 9b0f97591f..7ee23b8c9b 100644
--- a/Userland/Libraries/LibWeb/DOM/Comment.h
+++ b/Userland/Libraries/LibWeb/DOM/Comment.h
@@ -12,6 +12,7 @@ namespace Web::DOM {
 
 class Comment final : public CharacterData {
     WEB_PLATFORM_OBJECT(Comment, CharacterData);
+    JS_DECLARE_ALLOCATOR(Comment);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Comment>> construct_impl(JS::Realm&, String const& data);
diff --git a/Userland/Libraries/LibWeb/DOM/CustomEvent.cpp b/Userland/Libraries/LibWeb/DOM/CustomEvent.cpp
index 5f9e2ec275..31122fc203 100644
--- a/Userland/Libraries/LibWeb/DOM/CustomEvent.cpp
+++ b/Userland/Libraries/LibWeb/DOM/CustomEvent.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(CustomEvent);
+
 JS::NonnullGCPtr<CustomEvent> CustomEvent::create(JS::Realm& realm, FlyString const& event_name, CustomEventInit const& event_init)
 {
     return realm.heap().allocate<CustomEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/DOM/CustomEvent.h b/Userland/Libraries/LibWeb/DOM/CustomEvent.h
index 9c92bfa4b9..a6723403dd 100644
--- a/Userland/Libraries/LibWeb/DOM/CustomEvent.h
+++ b/Userland/Libraries/LibWeb/DOM/CustomEvent.h
@@ -19,6 +19,7 @@ struct CustomEventInit : public EventInit {
 // https://dom.spec.whatwg.org/#customevent
 class CustomEvent : public Event {
     WEB_PLATFORM_OBJECT(CustomEvent, Event);
+    JS_DECLARE_ALLOCATOR(CustomEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CustomEvent> create(JS::Realm&, FlyString const& event_name, CustomEventInit const& = {});
diff --git a/Userland/Libraries/LibWeb/DOM/DOMEventListener.cpp b/Userland/Libraries/LibWeb/DOM/DOMEventListener.cpp
index bdd3c988ac..64630eba75 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMEventListener.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DOMEventListener.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(DOMEventListener);
+
 DOMEventListener::DOMEventListener() = default;
 DOMEventListener::~DOMEventListener() = default;
 
diff --git a/Userland/Libraries/LibWeb/DOM/DOMEventListener.h b/Userland/Libraries/LibWeb/DOM/DOMEventListener.h
index fa0f8bbec0..1afb54e05f 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMEventListener.h
+++ b/Userland/Libraries/LibWeb/DOM/DOMEventListener.h
@@ -17,6 +17,7 @@ namespace Web::DOM {
 // NOTE: The spec calls this "event listener", and it's *importantly* not the same as "EventListener"
 class DOMEventListener : public JS::Cell {
     JS_CELL(DOMEventListener, JS::Cell);
+    JS_DECLARE_ALLOCATOR(DOMEventListener);
 
 public:
     DOMEventListener();
diff --git a/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp b/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp
index 6089b9bbef..4f53ce7b2f 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp
@@ -17,6 +17,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(DOMImplementation);
+
 JS::NonnullGCPtr<DOMImplementation> DOMImplementation::create(Document& document)
 {
     auto& realm = document.realm();
diff --git a/Userland/Libraries/LibWeb/DOM/DOMImplementation.h b/Userland/Libraries/LibWeb/DOM/DOMImplementation.h
index ab23f25a6b..f9b777aa92 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMImplementation.h
+++ b/Userland/Libraries/LibWeb/DOM/DOMImplementation.h
@@ -15,6 +15,7 @@ namespace Web::DOM {
 
 class DOMImplementation final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DOMImplementation, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMImplementation);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<DOMImplementation> create(Document&);
diff --git a/Userland/Libraries/LibWeb/DOM/DOMTokenList.cpp b/Userland/Libraries/LibWeb/DOM/DOMTokenList.cpp
index e6d3303157..637598ecbb 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMTokenList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DOMTokenList.cpp
@@ -52,6 +52,8 @@ inline void replace_in_ordered_set(Vector<String>& set, String const& item, Stri
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(DOMTokenList);
+
 JS::NonnullGCPtr<DOMTokenList> DOMTokenList::create(Element& associated_element, FlyString associated_attribute)
 {
     auto& realm = associated_element.realm();
diff --git a/Userland/Libraries/LibWeb/DOM/DOMTokenList.h b/Userland/Libraries/LibWeb/DOM/DOMTokenList.h
index 5c0352d87d..b986dc808e 100644
--- a/Userland/Libraries/LibWeb/DOM/DOMTokenList.h
+++ b/Userland/Libraries/LibWeb/DOM/DOMTokenList.h
@@ -22,6 +22,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#domtokenlist
 class DOMTokenList final : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(DOMTokenList, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMTokenList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<DOMTokenList> create(Element& associated_element, FlyString associated_attribute);
diff --git a/Userland/Libraries/LibWeb/DOM/Document.cpp b/Userland/Libraries/LibWeb/DOM/Document.cpp
index 58a901f227..f4e55357ad 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Document.cpp
@@ -106,6 +106,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Document);
+
 // https://html.spec.whatwg.org/multipage/origin.html#obtain-browsing-context-navigation
 static JS::NonnullGCPtr<HTML::BrowsingContext> obtain_a_browsing_context_to_use_for_a_navigation_response(
     HTML::BrowsingContext& browsing_context,
diff --git a/Userland/Libraries/LibWeb/DOM/Document.h b/Userland/Libraries/LibWeb/DOM/Document.h
index b633b72e84..35ada02356 100644
--- a/Userland/Libraries/LibWeb/DOM/Document.h
+++ b/Userland/Libraries/LibWeb/DOM/Document.h
@@ -81,6 +81,7 @@ class Document
     , public NonElementParentNode<Document>
     , public HTML::GlobalEventHandlers {
     WEB_PLATFORM_OBJECT(Document, ParentNode);
+    JS_DECLARE_ALLOCATOR(Document);
 
 public:
     enum class Type {
diff --git a/Userland/Libraries/LibWeb/DOM/DocumentFragment.cpp b/Userland/Libraries/LibWeb/DOM/DocumentFragment.cpp
index 890eeee8d0..4100968fd1 100644
--- a/Userland/Libraries/LibWeb/DOM/DocumentFragment.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DocumentFragment.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(DocumentFragment);
+
 DocumentFragment::DocumentFragment(Document& document)
     : ParentNode(document, NodeType::DOCUMENT_FRAGMENT_NODE)
 {
diff --git a/Userland/Libraries/LibWeb/DOM/DocumentFragment.h b/Userland/Libraries/LibWeb/DOM/DocumentFragment.h
index e2db8eb523..89556b2e1e 100644
--- a/Userland/Libraries/LibWeb/DOM/DocumentFragment.h
+++ b/Userland/Libraries/LibWeb/DOM/DocumentFragment.h
@@ -16,6 +16,7 @@ class DocumentFragment
     : public ParentNode
     , public NonElementParentNode<DocumentFragment> {
     WEB_PLATFORM_OBJECT(DocumentFragment, ParentNode);
+    JS_DECLARE_ALLOCATOR(DocumentFragment);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> construct_impl(JS::Realm& realm);
diff --git a/Userland/Libraries/LibWeb/DOM/DocumentObserver.cpp b/Userland/Libraries/LibWeb/DOM/DocumentObserver.cpp
index d1e1c19610..cae3266613 100644
--- a/Userland/Libraries/LibWeb/DOM/DocumentObserver.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DocumentObserver.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(DocumentObserver);
+
 DocumentObserver::DocumentObserver(JS::Realm& realm, DOM::Document& document)
     : Bindings::PlatformObject(realm)
     , m_document(document)
diff --git a/Userland/Libraries/LibWeb/DOM/DocumentObserver.h b/Userland/Libraries/LibWeb/DOM/DocumentObserver.h
index d48152ae01..d62a602ff8 100644
--- a/Userland/Libraries/LibWeb/DOM/DocumentObserver.h
+++ b/Userland/Libraries/LibWeb/DOM/DocumentObserver.h
@@ -16,6 +16,7 @@ namespace Web::DOM {
 
 class DocumentObserver final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DocumentObserver, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DocumentObserver);
 
 public:
     [[nodiscard]] JS::GCPtr<JS::HeapFunction<void()>> document_became_inactive() const { return m_document_became_inactive; }
diff --git a/Userland/Libraries/LibWeb/DOM/DocumentType.cpp b/Userland/Libraries/LibWeb/DOM/DocumentType.cpp
index 567ff1eca0..aa53139c04 100644
--- a/Userland/Libraries/LibWeb/DOM/DocumentType.cpp
+++ b/Userland/Libraries/LibWeb/DOM/DocumentType.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(DocumentType);
+
 JS::NonnullGCPtr<DocumentType> DocumentType::create(Document& document)
 {
     return document.heap().allocate<DocumentType>(document.realm(), document);
diff --git a/Userland/Libraries/LibWeb/DOM/DocumentType.h b/Userland/Libraries/LibWeb/DOM/DocumentType.h
index 2acdc1d488..26bd59a51d 100644
--- a/Userland/Libraries/LibWeb/DOM/DocumentType.h
+++ b/Userland/Libraries/LibWeb/DOM/DocumentType.h
@@ -16,6 +16,7 @@ class DocumentType final
     : public Node
     , public ChildNode<DocumentType> {
     WEB_PLATFORM_OBJECT(DocumentType, Node);
+    JS_DECLARE_ALLOCATOR(DocumentType);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<DocumentType> create(Document&);
diff --git a/Userland/Libraries/LibWeb/DOM/Event.cpp b/Userland/Libraries/LibWeb/DOM/Event.cpp
index 7491e54450..3a4fe8dc92 100644
--- a/Userland/Libraries/LibWeb/DOM/Event.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Event.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Event);
+
 JS::NonnullGCPtr<Event> Event::create(JS::Realm& realm, FlyString const& event_name, EventInit const& event_init)
 {
     return realm.heap().allocate<Event>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/DOM/Event.h b/Userland/Libraries/LibWeb/DOM/Event.h
index b6645130bb..3dd77c7eb4 100644
--- a/Userland/Libraries/LibWeb/DOM/Event.h
+++ b/Userland/Libraries/LibWeb/DOM/Event.h
@@ -20,6 +20,7 @@ struct EventInit {
 
 class Event : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Event, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Event);
 
 public:
     enum Phase : u16 {
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp b/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
index 38ac0940ab..088ca3223b 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(HTMLCollection);
+
 JS::NonnullGCPtr<HTMLCollection> HTMLCollection::create(ParentNode& root, Scope scope, Function<bool(Element const&)> filter)
 {
     return root.heap().allocate<HTMLCollection>(root.realm(), root, scope, move(filter));
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLCollection.h b/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
index c94724b1ba..3b28e7967d 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
+++ b/Userland/Libraries/LibWeb/DOM/HTMLCollection.h
@@ -27,6 +27,7 @@ namespace Web::DOM {
 
 class HTMLCollection : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(HTMLCollection, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(HTMLCollection);
 
 public:
     enum class Scope {
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp
index be5485f95b..ae3fafdb3c 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp
+++ b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(HTMLFormControlsCollection);
+
 JS::NonnullGCPtr<HTMLFormControlsCollection> HTMLFormControlsCollection::create(ParentNode& root, Scope scope, Function<bool(Element const&)> filter)
 {
     return root.heap().allocate<HTMLFormControlsCollection>(root.realm(), root, scope, move(filter));
diff --git a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h
index 7fd1e36fac..aa20f0c540 100644
--- a/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h
+++ b/Userland/Libraries/LibWeb/DOM/HTMLFormControlsCollection.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 
 class HTMLFormControlsCollection : public HTMLCollection {
     WEB_PLATFORM_OBJECT(HTMLFormControlsCollection, HTMLCollection);
+    JS_DECLARE_ALLOCATOR(HTMLFormControlsCollection);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<HTMLFormControlsCollection> create(ParentNode& root, Scope, Function<bool(Element const&)> filter);
diff --git a/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp b/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
index 2908cd740b..10b6169ab6 100644
--- a/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/LiveNodeList.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(LiveNodeList);
+
 JS::NonnullGCPtr<NodeList> LiveNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
 {
     return realm.heap().allocate<LiveNodeList>(realm, realm, root, scope, move(filter));
diff --git a/Userland/Libraries/LibWeb/DOM/LiveNodeList.h b/Userland/Libraries/LibWeb/DOM/LiveNodeList.h
index b99fcadde0..99de8533f4 100644
--- a/Userland/Libraries/LibWeb/DOM/LiveNodeList.h
+++ b/Userland/Libraries/LibWeb/DOM/LiveNodeList.h
@@ -16,6 +16,7 @@ namespace Web::DOM {
 
 class LiveNodeList : public NodeList {
     WEB_PLATFORM_OBJECT(LiveNodeList, NodeList);
+    JS_DECLARE_ALLOCATOR(LiveNodeList);
 
 public:
     enum class Scope {
diff --git a/Userland/Libraries/LibWeb/DOM/MutationObserver.cpp b/Userland/Libraries/LibWeb/DOM/MutationObserver.cpp
index 0be0af7e1d..d6cf1927a0 100644
--- a/Userland/Libraries/LibWeb/DOM/MutationObserver.cpp
+++ b/Userland/Libraries/LibWeb/DOM/MutationObserver.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(MutationObserver);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<MutationObserver>> MutationObserver::construct_impl(JS::Realm& realm, JS::GCPtr<WebIDL::CallbackType> callback)
 {
     return realm.heap().allocate<MutationObserver>(realm, realm, callback);
diff --git a/Userland/Libraries/LibWeb/DOM/MutationObserver.h b/Userland/Libraries/LibWeb/DOM/MutationObserver.h
index 0428991814..dae9ba3d1e 100644
--- a/Userland/Libraries/LibWeb/DOM/MutationObserver.h
+++ b/Userland/Libraries/LibWeb/DOM/MutationObserver.h
@@ -29,6 +29,7 @@ struct MutationObserverInit {
 // https://dom.spec.whatwg.org/#mutationobserver
 class MutationObserver final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(MutationObserver, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(MutationObserver);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<MutationObserver>> construct_impl(JS::Realm&, JS::GCPtr<WebIDL::CallbackType>);
diff --git a/Userland/Libraries/LibWeb/DOM/MutationRecord.cpp b/Userland/Libraries/LibWeb/DOM/MutationRecord.cpp
index f71a481de0..2d6ed58b1b 100644
--- a/Userland/Libraries/LibWeb/DOM/MutationRecord.cpp
+++ b/Userland/Libraries/LibWeb/DOM/MutationRecord.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(MutationRecord);
+
 JS::NonnullGCPtr<MutationRecord> MutationRecord::create(JS::Realm& realm, FlyString const& type, Node const& target, NodeList& added_nodes, NodeList& removed_nodes, Node* previous_sibling, Node* next_sibling, Optional<String> const& attribute_name, Optional<String> const& attribute_namespace, Optional<String> const& old_value)
 {
     return realm.heap().allocate<MutationRecord>(realm, realm, type, target, added_nodes, removed_nodes, previous_sibling, next_sibling, attribute_name, attribute_namespace, old_value);
diff --git a/Userland/Libraries/LibWeb/DOM/MutationRecord.h b/Userland/Libraries/LibWeb/DOM/MutationRecord.h
index 6d89813aec..aba2333a56 100644
--- a/Userland/Libraries/LibWeb/DOM/MutationRecord.h
+++ b/Userland/Libraries/LibWeb/DOM/MutationRecord.h
@@ -14,6 +14,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#mutationrecord
 class MutationRecord : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(MutationRecord, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(MutationRecord);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MutationRecord> create(JS::Realm&, FlyString const& type, Node const& target, NodeList& added_nodes, NodeList& removed_nodes, Node* previous_sibling, Node* next_sibling, Optional<String> const& attribute_name, Optional<String> const& attribute_namespace, Optional<String> const& old_value);
diff --git a/Userland/Libraries/LibWeb/DOM/NamedNodeMap.cpp b/Userland/Libraries/LibWeb/DOM/NamedNodeMap.cpp
index 912fd2b484..8e6c713b33 100644
--- a/Userland/Libraries/LibWeb/DOM/NamedNodeMap.cpp
+++ b/Userland/Libraries/LibWeb/DOM/NamedNodeMap.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(NamedNodeMap);
+
 JS::NonnullGCPtr<NamedNodeMap> NamedNodeMap::create(Element& element)
 {
     auto& realm = element.realm();
diff --git a/Userland/Libraries/LibWeb/DOM/NamedNodeMap.h b/Userland/Libraries/LibWeb/DOM/NamedNodeMap.h
index 3c1591f97e..8dd2c19b0f 100644
--- a/Userland/Libraries/LibWeb/DOM/NamedNodeMap.h
+++ b/Userland/Libraries/LibWeb/DOM/NamedNodeMap.h
@@ -20,6 +20,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#interface-namednodemap
 class NamedNodeMap : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(NamedNodeMap, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(NamedNodeMap);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NamedNodeMap> create(Element&);
diff --git a/Userland/Libraries/LibWeb/DOM/NodeFilter.cpp b/Userland/Libraries/LibWeb/DOM/NodeFilter.cpp
index accc89fc19..59625ff414 100644
--- a/Userland/Libraries/LibWeb/DOM/NodeFilter.cpp
+++ b/Userland/Libraries/LibWeb/DOM/NodeFilter.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(NodeFilter);
+
 JS::NonnullGCPtr<NodeFilter> NodeFilter::create(JS::Realm& realm, WebIDL::CallbackType& callback)
 {
     return realm.heap().allocate<NodeFilter>(realm, realm, callback);
diff --git a/Userland/Libraries/LibWeb/DOM/NodeFilter.h b/Userland/Libraries/LibWeb/DOM/NodeFilter.h
index 387c01cbe1..1f41ce6915 100644
--- a/Userland/Libraries/LibWeb/DOM/NodeFilter.h
+++ b/Userland/Libraries/LibWeb/DOM/NodeFilter.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 
 class NodeFilter final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(NodeFilter, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(NodeFilter);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NodeFilter> create(JS::Realm&, WebIDL::CallbackType&);
diff --git a/Userland/Libraries/LibWeb/DOM/NodeIterator.cpp b/Userland/Libraries/LibWeb/DOM/NodeIterator.cpp
index 9b66cf0c85..44db2c7c66 100644
--- a/Userland/Libraries/LibWeb/DOM/NodeIterator.cpp
+++ b/Userland/Libraries/LibWeb/DOM/NodeIterator.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(NodeIterator);
+
 NodeIterator::NodeIterator(Node& root)
     : PlatformObject(root.realm())
     , m_root(root)
diff --git a/Userland/Libraries/LibWeb/DOM/NodeIterator.h b/Userland/Libraries/LibWeb/DOM/NodeIterator.h
index d1c484a714..cc7ae7771e 100644
--- a/Userland/Libraries/LibWeb/DOM/NodeIterator.h
+++ b/Userland/Libraries/LibWeb/DOM/NodeIterator.h
@@ -14,6 +14,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#nodeiterator
 class NodeIterator final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(NodeIterator, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(NodeIterator);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<NodeIterator>> create(Node& root, unsigned what_to_show, JS::GCPtr<NodeFilter>);
diff --git a/Userland/Libraries/LibWeb/DOM/Position.cpp b/Userland/Libraries/LibWeb/DOM/Position.cpp
index c66863946e..6d6b68370f 100644
--- a/Userland/Libraries/LibWeb/DOM/Position.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Position.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Position);
+
 Position::Position(JS::GCPtr<Node> node, unsigned offset)
     : m_node(node)
     , m_offset(offset)
diff --git a/Userland/Libraries/LibWeb/DOM/Position.h b/Userland/Libraries/LibWeb/DOM/Position.h
index aa92c49049..47e37cc87d 100644
--- a/Userland/Libraries/LibWeb/DOM/Position.h
+++ b/Userland/Libraries/LibWeb/DOM/Position.h
@@ -18,6 +18,7 @@ namespace Web::DOM {
 
 class Position final : public JS::Cell {
     JS_CELL(Position, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Position);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Position> create(JS::Realm& realm, JS::NonnullGCPtr<Node> node, unsigned offset)
diff --git a/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp b/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp
index 3dd85d68de..60fb219769 100644
--- a/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp
+++ b/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(ProcessingInstruction);
+
 ProcessingInstruction::ProcessingInstruction(Document& document, DeprecatedString const& data, DeprecatedString const& target)
     : CharacterData(document, NodeType::PROCESSING_INSTRUCTION_NODE, MUST(String::from_deprecated_string(data)))
     , m_target(target)
diff --git a/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.h b/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.h
index faa05a8f7b..859045c848 100644
--- a/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.h
+++ b/Userland/Libraries/LibWeb/DOM/ProcessingInstruction.h
@@ -12,6 +12,7 @@ namespace Web::DOM {
 
 class ProcessingInstruction final : public CharacterData {
     WEB_PLATFORM_OBJECT(ProcessingInstruction, CharacterData);
+    JS_DECLARE_ALLOCATOR(ProcessingInstruction);
 
 public:
     virtual ~ProcessingInstruction() override = default;
diff --git a/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp b/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp
index f923cc1e52..a1d63f4f37 100644
--- a/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/RadioNodeList.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(RadioNodeList);
+
 JS::NonnullGCPtr<RadioNodeList> RadioNodeList::create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter)
 {
     return realm.heap().allocate<RadioNodeList>(realm, realm, root, scope, move(filter));
diff --git a/Userland/Libraries/LibWeb/DOM/RadioNodeList.h b/Userland/Libraries/LibWeb/DOM/RadioNodeList.h
index 8204ca7740..bcf1991b5f 100644
--- a/Userland/Libraries/LibWeb/DOM/RadioNodeList.h
+++ b/Userland/Libraries/LibWeb/DOM/RadioNodeList.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 // https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#radionodelist
 class RadioNodeList : public LiveNodeList {
     WEB_PLATFORM_OBJECT(RadioNodeList, LiveNodeList);
+    JS_DECLARE_ALLOCATOR(RadioNodeList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<RadioNodeList> create(JS::Realm& realm, Node& root, Scope scope, Function<bool(Node const&)> filter);
diff --git a/Userland/Libraries/LibWeb/DOM/Range.cpp b/Userland/Libraries/LibWeb/DOM/Range.cpp
index 0e8ba573d6..d85e77076c 100644
--- a/Userland/Libraries/LibWeb/DOM/Range.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Range.cpp
@@ -25,6 +25,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Range);
+
 HashTable<Range*>& Range::live_ranges()
 {
     static HashTable<Range*> ranges;
diff --git a/Userland/Libraries/LibWeb/DOM/Range.h b/Userland/Libraries/LibWeb/DOM/Range.h
index a855ec9081..146c08a5a7 100644
--- a/Userland/Libraries/LibWeb/DOM/Range.h
+++ b/Userland/Libraries/LibWeb/DOM/Range.h
@@ -24,6 +24,7 @@ RelativeBoundaryPointPosition position_of_boundary_point_relative_to_other_bound
 
 class Range final : public AbstractRange {
     WEB_PLATFORM_OBJECT(Range, AbstractRange);
+    JS_DECLARE_ALLOCATOR(Range);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Range> create(Document&);
diff --git a/Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp b/Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp
index 3e55aca37c..26deaba174 100644
--- a/Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp
+++ b/Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(ShadowRoot);
+
 ShadowRoot::ShadowRoot(Document& document, Element& host, Bindings::ShadowRootMode mode)
     : DocumentFragment(document)
     , m_mode(mode)
diff --git a/Userland/Libraries/LibWeb/DOM/ShadowRoot.h b/Userland/Libraries/LibWeb/DOM/ShadowRoot.h
index 1456fbb9f0..acdc8d98ac 100644
--- a/Userland/Libraries/LibWeb/DOM/ShadowRoot.h
+++ b/Userland/Libraries/LibWeb/DOM/ShadowRoot.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 
 class ShadowRoot final : public DocumentFragment {
     WEB_PLATFORM_OBJECT(ShadowRoot, DocumentFragment);
+    JS_DECLARE_ALLOCATOR(ShadowRoot);
 
 public:
     Bindings::ShadowRootMode mode() const { return m_mode; }
diff --git a/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp b/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp
index 591616e8c2..5d85412a1d 100644
--- a/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp
+++ b/Userland/Libraries/LibWeb/DOM/StaticNodeList.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(StaticNodeList);
+
 JS::NonnullGCPtr<NodeList> StaticNodeList::create(JS::Realm& realm, Vector<JS::Handle<Node>> static_nodes)
 {
     return realm.heap().allocate<StaticNodeList>(realm, realm, move(static_nodes));
diff --git a/Userland/Libraries/LibWeb/DOM/StaticNodeList.h b/Userland/Libraries/LibWeb/DOM/StaticNodeList.h
index 86f6c15db9..5ed9b75e57 100644
--- a/Userland/Libraries/LibWeb/DOM/StaticNodeList.h
+++ b/Userland/Libraries/LibWeb/DOM/StaticNodeList.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 
 class StaticNodeList final : public NodeList {
     WEB_PLATFORM_OBJECT(StaticNodeList, NodeList);
+    JS_DECLARE_ALLOCATOR(StaticNodeList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NodeList> create(JS::Realm&, Vector<JS::Handle<Node>>);
diff --git a/Userland/Libraries/LibWeb/DOM/StaticRange.cpp b/Userland/Libraries/LibWeb/DOM/StaticRange.cpp
index 595665b3ac..161d3ea419 100644
--- a/Userland/Libraries/LibWeb/DOM/StaticRange.cpp
+++ b/Userland/Libraries/LibWeb/DOM/StaticRange.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(StaticRange);
+
 StaticRange::StaticRange(Node& start_container, u32 start_offset, Node& end_container, u32 end_offset)
     : AbstractRange(start_container, start_offset, end_container, end_offset)
 {
diff --git a/Userland/Libraries/LibWeb/DOM/StaticRange.h b/Userland/Libraries/LibWeb/DOM/StaticRange.h
index 8ec05fbb5d..0afca39abe 100644
--- a/Userland/Libraries/LibWeb/DOM/StaticRange.h
+++ b/Userland/Libraries/LibWeb/DOM/StaticRange.h
@@ -22,6 +22,7 @@ struct StaticRangeInit {
 
 class StaticRange final : public AbstractRange {
     WEB_PLATFORM_OBJECT(StaticRange, AbstractRange);
+    JS_DECLARE_ALLOCATOR(StaticRange);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<StaticRange>> construct_impl(JS::Realm&, StaticRangeInit& init);
diff --git a/Userland/Libraries/LibWeb/DOM/Text.cpp b/Userland/Libraries/LibWeb/DOM/Text.cpp
index 8d5279c8c9..1118f63cd6 100644
--- a/Userland/Libraries/LibWeb/DOM/Text.cpp
+++ b/Userland/Libraries/LibWeb/DOM/Text.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(Text);
+
 Text::Text(Document& document, String const& data)
     : CharacterData(document, NodeType::TEXT_NODE, data)
 {
diff --git a/Userland/Libraries/LibWeb/DOM/Text.h b/Userland/Libraries/LibWeb/DOM/Text.h
index 66aacbc134..a7dae767f8 100644
--- a/Userland/Libraries/LibWeb/DOM/Text.h
+++ b/Userland/Libraries/LibWeb/DOM/Text.h
@@ -22,6 +22,7 @@ class Text
     : public CharacterData
     , public SlottableMixin {
     WEB_PLATFORM_OBJECT(Text, CharacterData);
+    JS_DECLARE_ALLOCATOR(Text);
 
 public:
     virtual ~Text() override = default;
diff --git a/Userland/Libraries/LibWeb/DOM/TreeWalker.cpp b/Userland/Libraries/LibWeb/DOM/TreeWalker.cpp
index 69ef86606f..519040f367 100644
--- a/Userland/Libraries/LibWeb/DOM/TreeWalker.cpp
+++ b/Userland/Libraries/LibWeb/DOM/TreeWalker.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(TreeWalker);
+
 TreeWalker::TreeWalker(Node& root)
     : PlatformObject(root.realm())
     , m_root(root)
diff --git a/Userland/Libraries/LibWeb/DOM/TreeWalker.h b/Userland/Libraries/LibWeb/DOM/TreeWalker.h
index b6e182ff7d..b3e5ad9577 100644
--- a/Userland/Libraries/LibWeb/DOM/TreeWalker.h
+++ b/Userland/Libraries/LibWeb/DOM/TreeWalker.h
@@ -13,6 +13,7 @@ namespace Web::DOM {
 // https://dom.spec.whatwg.org/#treewalker
 class TreeWalker final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TreeWalker, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TreeWalker);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<TreeWalker> create(Node& root, unsigned what_to_show, JS::GCPtr<NodeFilter>);
diff --git a/Userland/Libraries/LibWeb/DOM/XMLDocument.cpp b/Userland/Libraries/LibWeb/DOM/XMLDocument.cpp
index 28c824ba2d..255478ab80 100644
--- a/Userland/Libraries/LibWeb/DOM/XMLDocument.cpp
+++ b/Userland/Libraries/LibWeb/DOM/XMLDocument.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::DOM {
 
+JS_DEFINE_ALLOCATOR(XMLDocument);
+
 JS::NonnullGCPtr<XMLDocument> XMLDocument::create(JS::Realm& realm, AK::URL const& url)
 {
     return realm.heap().allocate<XMLDocument>(realm, realm, url);
diff --git a/Userland/Libraries/LibWeb/DOM/XMLDocument.h b/Userland/Libraries/LibWeb/DOM/XMLDocument.h
index 60a019e4be..2c2b7152e7 100644
--- a/Userland/Libraries/LibWeb/DOM/XMLDocument.h
+++ b/Userland/Libraries/LibWeb/DOM/XMLDocument.h
@@ -12,6 +12,7 @@ namespace Web::DOM {
 
 class XMLDocument final : public Document {
     WEB_PLATFORM_OBJECT(XMLDocument, Document);
+    JS_DECLARE_ALLOCATOR(XMLDocument);
 
 public:
     static JS::NonnullGCPtr<XMLDocument> create(JS::Realm&, AK::URL const&);
diff --git a/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.cpp b/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.cpp
index 79ee92e614..d0ad3aad6d 100644
--- a/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.cpp
+++ b/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.cpp
@@ -23,6 +23,8 @@
 
 namespace Web::DOMParsing {
 
+JS_DEFINE_ALLOCATOR(XMLSerializer);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<XMLSerializer>> XMLSerializer::construct_impl(JS::Realm& realm)
 {
     return realm.heap().allocate<XMLSerializer>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.h b/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.h
index b5ba350daf..7527b39b87 100644
--- a/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.h
+++ b/Userland/Libraries/LibWeb/DOMParsing/XMLSerializer.h
@@ -12,6 +12,7 @@ namespace Web::DOMParsing {
 
 class XMLSerializer final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(XMLSerializer, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(XMLSerializer);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<XMLSerializer>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Encoding/TextDecoder.cpp b/Userland/Libraries/LibWeb/Encoding/TextDecoder.cpp
index 1df868e2f5..50c9372511 100644
--- a/Userland/Libraries/LibWeb/Encoding/TextDecoder.cpp
+++ b/Userland/Libraries/LibWeb/Encoding/TextDecoder.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Encoding {
 
+JS_DEFINE_ALLOCATOR(TextDecoder);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<TextDecoder>> TextDecoder::construct_impl(JS::Realm& realm, FlyString encoding, Optional<TextDecoderOptions> const& options)
 {
     auto& vm = realm.vm();
diff --git a/Userland/Libraries/LibWeb/Encoding/TextDecoder.h b/Userland/Libraries/LibWeb/Encoding/TextDecoder.h
index 8bd4e8265a..14cf851136 100644
--- a/Userland/Libraries/LibWeb/Encoding/TextDecoder.h
+++ b/Userland/Libraries/LibWeb/Encoding/TextDecoder.h
@@ -30,6 +30,7 @@ struct TextDecodeOptions {
 // https://encoding.spec.whatwg.org/#textdecoder
 class TextDecoder : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TextDecoder, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TextDecoder);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<TextDecoder>> construct_impl(JS::Realm&, FlyString encoding, Optional<TextDecoderOptions> const& options = {});
diff --git a/Userland/Libraries/LibWeb/Encoding/TextEncoder.cpp b/Userland/Libraries/LibWeb/Encoding/TextEncoder.cpp
index 560a804262..7f63234851 100644
--- a/Userland/Libraries/LibWeb/Encoding/TextEncoder.cpp
+++ b/Userland/Libraries/LibWeb/Encoding/TextEncoder.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::Encoding {
 
+JS_DEFINE_ALLOCATOR(TextEncoder);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<TextEncoder>> TextEncoder::construct_impl(JS::Realm& realm)
 {
     return realm.heap().allocate<TextEncoder>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/Encoding/TextEncoder.h b/Userland/Libraries/LibWeb/Encoding/TextEncoder.h
index 8ebf851448..044b05d7b1 100644
--- a/Userland/Libraries/LibWeb/Encoding/TextEncoder.h
+++ b/Userland/Libraries/LibWeb/Encoding/TextEncoder.h
@@ -24,6 +24,7 @@ struct TextEncoderEncodeIntoResult {
 // https://encoding.spec.whatwg.org/#textencoder
 class TextEncoder final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TextEncoder, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TextEncoder);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<TextEncoder>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.cpp b/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.cpp
index b3305128f0..437d20b298 100644
--- a/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Fetch::Fetching {
 
+JS_DEFINE_ALLOCATOR(PendingResponse);
+
 JS::NonnullGCPtr<PendingResponse> PendingResponse::create(JS::VM& vm, JS::NonnullGCPtr<Infrastructure::Request> request)
 {
     return vm.heap().allocate_without_realm<PendingResponse>(request);
diff --git a/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.h b/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.h
index 3d07e02e05..e95d5d016f 100644
--- a/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.h
+++ b/Userland/Libraries/LibWeb/Fetch/Fetching/PendingResponse.h
@@ -20,6 +20,7 @@ namespace Web::Fetch::Fetching {
 // therefore we use callbacks to run portions of the spec that require waiting for an HTTP load.
 class PendingResponse : public JS::Cell {
     JS_CELL(PendingResponse, JS::Cell);
+    JS_DECLARE_ALLOCATOR(PendingResponse);
 
 public:
     using Callback = JS::SafeFunction<void(JS::NonnullGCPtr<Infrastructure::Response>)>;
diff --git a/Userland/Libraries/LibWeb/Fetch/Headers.cpp b/Userland/Libraries/LibWeb/Fetch/Headers.cpp
index 3c5a5e721d..153ae81704 100644
--- a/Userland/Libraries/LibWeb/Fetch/Headers.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Headers.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::Fetch {
 
+JS_DEFINE_ALLOCATOR(Headers);
+
 // https://fetch.spec.whatwg.org/#dom-headers
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Headers>> Headers::construct_impl(JS::Realm& realm, Optional<HeadersInit> const& init)
 {
diff --git a/Userland/Libraries/LibWeb/Fetch/Headers.h b/Userland/Libraries/LibWeb/Fetch/Headers.h
index 984e720ce2..4f4e9ff5e9 100644
--- a/Userland/Libraries/LibWeb/Fetch/Headers.h
+++ b/Userland/Libraries/LibWeb/Fetch/Headers.h
@@ -23,6 +23,7 @@ using HeadersInit = Variant<Vector<Vector<String>>, OrderedHashMap<String, Strin
 // https://fetch.spec.whatwg.org/#headers-class
 class Headers final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Headers, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Headers);
 
 public:
     enum class Guard {
diff --git a/Userland/Libraries/LibWeb/Fetch/HeadersIterator.cpp b/Userland/Libraries/LibWeb/Fetch/HeadersIterator.cpp
index cdbdc28955..04a6930885 100644
--- a/Userland/Libraries/LibWeb/Fetch/HeadersIterator.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/HeadersIterator.cpp
@@ -23,6 +23,8 @@ void Intrinsics::create_web_prototype_and_constructor<HeadersIteratorPrototype>(
 
 namespace Web::Fetch {
 
+JS_DEFINE_ALLOCATOR(HeadersIterator);
+
 JS::NonnullGCPtr<HeadersIterator> HeadersIterator::create(Headers const& headers, JS::Object::PropertyKind iteration_kind)
 {
     return headers.heap().allocate<HeadersIterator>(headers.realm(), headers, iteration_kind);
diff --git a/Userland/Libraries/LibWeb/Fetch/HeadersIterator.h b/Userland/Libraries/LibWeb/Fetch/HeadersIterator.h
index 575abf97ea..3ef3c5dafe 100644
--- a/Userland/Libraries/LibWeb/Fetch/HeadersIterator.h
+++ b/Userland/Libraries/LibWeb/Fetch/HeadersIterator.h
@@ -14,6 +14,7 @@ namespace Web::Fetch {
 
 class HeadersIterator final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(HeadersIterator, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(HeadersIterator);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<HeadersIterator> create(Headers const&, JS::Object::PropertyKind iteration_kind);
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.cpp
index 9f4e968a74..b1773751a1 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(ConnectionTimingInfo);
+
 ConnectionTimingInfo::ConnectionTimingInfo() = default;
 
 JS::NonnullGCPtr<ConnectionTimingInfo> ConnectionTimingInfo::create(JS::VM& vm)
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.h
index 52a81c8eff..1e544853d4 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/ConnectionTimingInfo.h
@@ -16,6 +16,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#connection-timing-info
 class ConnectionTimingInfo : public JS::Cell {
     JS_CELL(ConnectionTimingInfo, JS::Cell);
+    JS_DECLARE_ALLOCATOR(ConnectionTimingInfo);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ConnectionTimingInfo> create(JS::VM&);
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.cpp
index 2fc7e5c758..64de30d724 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(FetchAlgorithms);
+
 JS::NonnullGCPtr<FetchAlgorithms> FetchAlgorithms::create(JS::VM& vm, Input input)
 {
     auto process_request_body_chunk_length = JS::create_heap_function(vm.heap(), move(input.process_request_body_chunk_length));
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.h
index b6eda21a28..421aa3eb07 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchAlgorithms.h
@@ -18,6 +18,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#fetch-elsewhere-fetch
 class FetchAlgorithms : public JS::Cell {
     JS_CELL(FetchAlgorithms, JS::Cell);
+    JS_DECLARE_ALLOCATOR(FetchAlgorithms);
 
 public:
     struct ConsumeBodyFailureTag { };
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.cpp
index ff47328d77..b3805800d8 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(FetchController);
+
 FetchController::FetchController() = default;
 
 JS::NonnullGCPtr<FetchController> FetchController::create(JS::VM& vm)
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.h
index e519a97056..7828660d3c 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchController.h
@@ -21,6 +21,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#fetch-controller
 class FetchController : public JS::Cell {
     JS_CELL(FetchController, JS::Cell);
+    JS_DECLARE_ALLOCATOR(FetchController);
 
 public:
     enum class State {
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.cpp
index cd0c64f48a..fd926fb408 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(FetchParams);
+
 FetchParams::FetchParams(JS::NonnullGCPtr<Request> request, JS::NonnullGCPtr<FetchAlgorithms> algorithms, JS::NonnullGCPtr<FetchController> controller, JS::NonnullGCPtr<FetchTimingInfo> timing_info)
     : m_request(request)
     , m_algorithms(algorithms)
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.h
index fc1e49aa77..31da8ba9b3 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/FetchParams.h
@@ -21,6 +21,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#fetch-params
 class FetchParams : public JS::Cell {
     JS_CELL(FetchParams, JS::Cell);
+    JS_DECLARE_ALLOCATOR(FetchParams);
 
 public:
     struct PreloadedResponseCandidatePendingTag { };
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp
index 3f868fe399..db13c8c7bd 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(Body);
+
 JS::NonnullGCPtr<Body> Body::create(JS::VM& vm, JS::NonnullGCPtr<Streams::ReadableStream> stream)
 {
     return vm.heap().allocate_without_realm<Body>(stream);
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h
index 7923094d85..dac79909c3 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Bodies.h
@@ -23,6 +23,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#concept-body
 class Body final : public JS::Cell {
     JS_CELL(Body, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Body);
 
 public:
     using SourceType = Variant<Empty, ByteBuffer, JS::Handle<FileAPI::Blob>>;
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.cpp
index 7d1194f514..36bcb63349 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(Request);
+
 Request::Request(JS::NonnullGCPtr<HeaderList> header_list)
     : m_header_list(header_list)
 {
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.h
index 1f04a5f490..bcc00bc778 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.h
@@ -29,6 +29,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#concept-request
 class Request final : public JS::Cell {
     JS_CELL(Request, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Request);
 
 public:
     enum class CacheMode {
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp
index 64b5be1f70..f59c151827 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp
@@ -17,6 +17,12 @@
 
 namespace Web::Fetch::Infrastructure {
 
+JS_DEFINE_ALLOCATOR(Response);
+JS_DEFINE_ALLOCATOR(BasicFilteredResponse);
+JS_DEFINE_ALLOCATOR(CORSFilteredResponse);
+JS_DEFINE_ALLOCATOR(OpaqueFilteredResponse);
+JS_DEFINE_ALLOCATOR(OpaqueRedirectFilteredResponse);
+
 Response::Response(JS::NonnullGCPtr<HeaderList> header_list)
     : m_header_list(header_list)
 {
diff --git a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.h b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.h
index a31f077dce..4dae9240bc 100644
--- a/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.h
+++ b/Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.h
@@ -24,6 +24,7 @@ namespace Web::Fetch::Infrastructure {
 // https://fetch.spec.whatwg.org/#concept-response
 class Response : public JS::Cell {
     JS_CELL(Response, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Response);
 
 public:
     enum class CacheState {
@@ -223,6 +224,7 @@ private:
 // https://fetch.spec.whatwg.org/#concept-filtered-response-basic
 class BasicFilteredResponse final : public FilteredResponse {
     JS_CELL(OpaqueRedirectFilteredResponse, FilteredResponse);
+    JS_DECLARE_ALLOCATOR(BasicFilteredResponse);
 
 public:
     [[nodiscard]] static ErrorOr<JS::NonnullGCPtr<BasicFilteredResponse>> create(JS::VM&, JS::NonnullGCPtr<Response>);
@@ -241,6 +243,7 @@ private:
 // https://fetch.spec.whatwg.org/#concept-filtered-response-cors
 class CORSFilteredResponse final : public FilteredResponse {
     JS_CELL(CORSFilteredResponse, FilteredResponse);
+    JS_DECLARE_ALLOCATOR(CORSFilteredResponse);
 
 public:
     [[nodiscard]] static ErrorOr<JS::NonnullGCPtr<CORSFilteredResponse>> create(JS::VM&, JS::NonnullGCPtr<Response>);
@@ -259,6 +262,7 @@ private:
 // https://fetch.spec.whatwg.org/#concept-filtered-response-opaque
 class OpaqueFilteredResponse final : public FilteredResponse {
     JS_CELL(OpaqueFilteredResponse, FilteredResponse);
+    JS_DECLARE_ALLOCATOR(OpaqueFilteredResponse);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<OpaqueFilteredResponse> create(JS::VM&, JS::NonnullGCPtr<Response>);
@@ -285,6 +289,7 @@ private:
 // https://fetch.spec.whatwg.org/#concept-filtered-response-opaque-redirect
 class OpaqueRedirectFilteredResponse final : public FilteredResponse {
     JS_CELL(OpaqueRedirectFilteredResponse, FilteredResponse);
+    JS_DECLARE_ALLOCATOR(OpaqueRedirectFilteredResponse);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<OpaqueRedirectFilteredResponse> create(JS::VM&, JS::NonnullGCPtr<Response>);
diff --git a/Userland/Libraries/LibWeb/Fetch/Request.cpp b/Userland/Libraries/LibWeb/Fetch/Request.cpp
index ad28e994e5..74c8414818 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Request.cpp
@@ -21,6 +21,8 @@
 
 namespace Web::Fetch {
 
+JS_DEFINE_ALLOCATOR(Request);
+
 Request::Request(JS::Realm& realm, JS::NonnullGCPtr<Infrastructure::Request> request)
     : PlatformObject(realm)
     , m_request(request)
diff --git a/Userland/Libraries/LibWeb/Fetch/Request.h b/Userland/Libraries/LibWeb/Fetch/Request.h
index eccfe24e20..7eb53fa407 100644
--- a/Userland/Libraries/LibWeb/Fetch/Request.h
+++ b/Userland/Libraries/LibWeb/Fetch/Request.h
@@ -64,6 +64,7 @@ class Request final
     : public Bindings::PlatformObject
     , public BodyMixin {
     WEB_PLATFORM_OBJECT(Request, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Request);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Request> create(JS::Realm&, JS::NonnullGCPtr<Infrastructure::Request>, Headers::Guard);
diff --git a/Userland/Libraries/LibWeb/Fetch/Response.cpp b/Userland/Libraries/LibWeb/Fetch/Response.cpp
index db0f0a031d..6f81ad9187 100644
--- a/Userland/Libraries/LibWeb/Fetch/Response.cpp
+++ b/Userland/Libraries/LibWeb/Fetch/Response.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::Fetch {
 
+JS_DEFINE_ALLOCATOR(Response);
+
 Response::Response(JS::Realm& realm, JS::NonnullGCPtr<Infrastructure::Response> response)
     : PlatformObject(realm)
     , m_response(response)
diff --git a/Userland/Libraries/LibWeb/Fetch/Response.h b/Userland/Libraries/LibWeb/Fetch/Response.h
index d06d4fb70e..bce68a53cf 100644
--- a/Userland/Libraries/LibWeb/Fetch/Response.h
+++ b/Userland/Libraries/LibWeb/Fetch/Response.h
@@ -31,6 +31,7 @@ class Response final
     : public Bindings::PlatformObject
     , public BodyMixin {
     WEB_PLATFORM_OBJECT(Response, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Response);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Response> create(JS::Realm&, JS::NonnullGCPtr<Infrastructure::Response>, Headers::Guard);
diff --git a/Userland/Libraries/LibWeb/FileAPI/Blob.cpp b/Userland/Libraries/LibWeb/FileAPI/Blob.cpp
index cc8124b57b..aaddf967b9 100644
--- a/Userland/Libraries/LibWeb/FileAPI/Blob.cpp
+++ b/Userland/Libraries/LibWeb/FileAPI/Blob.cpp
@@ -22,6 +22,8 @@
 
 namespace Web::FileAPI {
 
+JS_DEFINE_ALLOCATOR(Blob);
+
 JS::NonnullGCPtr<Blob> Blob::create(JS::Realm& realm, ByteBuffer byte_buffer, String type)
 {
     return realm.heap().allocate<Blob>(realm, realm, move(byte_buffer), move(type));
diff --git a/Userland/Libraries/LibWeb/FileAPI/Blob.h b/Userland/Libraries/LibWeb/FileAPI/Blob.h
index 2f4658f440..8c9ee266b9 100644
--- a/Userland/Libraries/LibWeb/FileAPI/Blob.h
+++ b/Userland/Libraries/LibWeb/FileAPI/Blob.h
@@ -28,6 +28,7 @@ struct BlobPropertyBag {
 
 class Blob : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Blob, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Blob);
 
 public:
     virtual ~Blob() override;
diff --git a/Userland/Libraries/LibWeb/FileAPI/File.cpp b/Userland/Libraries/LibWeb/FileAPI/File.cpp
index 95a87c8ccf..2240d893fb 100644
--- a/Userland/Libraries/LibWeb/FileAPI/File.cpp
+++ b/Userland/Libraries/LibWeb/FileAPI/File.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::FileAPI {
 
+JS_DEFINE_ALLOCATOR(File);
+
 File::File(JS::Realm& realm, ByteBuffer byte_buffer, String file_name, String type, i64 last_modified)
     : Blob(realm, move(byte_buffer), move(type))
     , m_name(move(file_name))
diff --git a/Userland/Libraries/LibWeb/FileAPI/File.h b/Userland/Libraries/LibWeb/FileAPI/File.h
index 0e2b0d3e1a..3cfc9f88fc 100644
--- a/Userland/Libraries/LibWeb/FileAPI/File.h
+++ b/Userland/Libraries/LibWeb/FileAPI/File.h
@@ -16,6 +16,7 @@ struct FilePropertyBag : BlobPropertyBag {
 
 class File : public Blob {
     WEB_PLATFORM_OBJECT(File, Blob);
+    JS_DECLARE_ALLOCATOR(File);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<File>> create(JS::Realm&, Vector<BlobPart> const& file_bits, String const& file_name, Optional<FilePropertyBag> const& options = {});
diff --git a/Userland/Libraries/LibWeb/FileAPI/FileList.h b/Userland/Libraries/LibWeb/FileAPI/FileList.h
index fe44e10d9b..997aa50d65 100644
--- a/Userland/Libraries/LibWeb/FileAPI/FileList.h
+++ b/Userland/Libraries/LibWeb/FileAPI/FileList.h
@@ -16,6 +16,7 @@ namespace Web::FileAPI {
 
 class FileList : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(FileList, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(FileList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<FileList> create(JS::Realm&, Vector<JS::NonnullGCPtr<File>>&&);
diff --git a/Userland/Libraries/LibWeb/FileAPI/FileReader.cpp b/Userland/Libraries/LibWeb/FileAPI/FileReader.cpp
index 2b8a2ec44f..0a4d7cc125 100644
--- a/Userland/Libraries/LibWeb/FileAPI/FileReader.cpp
+++ b/Userland/Libraries/LibWeb/FileAPI/FileReader.cpp
@@ -30,6 +30,8 @@
 
 namespace Web::FileAPI {
 
+JS_DEFINE_ALLOCATOR(FileReader);
+
 FileReader::~FileReader() = default;
 
 FileReader::FileReader(JS::Realm& realm)
diff --git a/Userland/Libraries/LibWeb/FileAPI/FileReader.h b/Userland/Libraries/LibWeb/FileAPI/FileReader.h
index ed79f4474c..cf5b64e782 100644
--- a/Userland/Libraries/LibWeb/FileAPI/FileReader.h
+++ b/Userland/Libraries/LibWeb/FileAPI/FileReader.h
@@ -17,6 +17,7 @@ namespace Web::FileAPI {
 // https://w3c.github.io/FileAPI/#dfn-filereader
 class FileReader : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(FileReader, EventTarget);
+    JS_DECLARE_ALLOCATOR(FileReader);
 
 public:
     using Result = Variant<Empty, String, JS::Handle<JS::ArrayBuffer>>;
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMMatrix.cpp b/Userland/Libraries/LibWeb/Geometry/DOMMatrix.cpp
index 7a0649945f..0ca5aba2f1 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMMatrix.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMMatrix.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMMatrix);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMMatrix>> DOMMatrix::construct_impl(JS::Realm& realm, Optional<Variant<String, Vector<double>>> const& init)
 {
     auto& vm = realm.vm();
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMMatrix.h b/Userland/Libraries/LibWeb/Geometry/DOMMatrix.h
index ceb29264f6..72ce3378db 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMMatrix.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMMatrix.h
@@ -14,6 +14,7 @@ namespace Web::Geometry {
 // https://drafts.fxtf.org/geometry/#dommatrix
 class DOMMatrix : public DOMMatrixReadOnly {
     WEB_PLATFORM_OBJECT(DOMMatrix, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMMatrix);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMMatrix>> construct_impl(JS::Realm&, Optional<Variant<String, Vector<double>>> const& init);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPoint.cpp b/Userland/Libraries/LibWeb/Geometry/DOMPoint.cpp
index cd2a160629..4b86e32c8a 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPoint.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPoint.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMPoint);
+
 JS::NonnullGCPtr<DOMPoint> DOMPoint::construct_impl(JS::Realm& realm, double x, double y, double z, double w)
 {
     return realm.heap().allocate<DOMPoint>(realm, realm, x, y, z, w);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPoint.h b/Userland/Libraries/LibWeb/Geometry/DOMPoint.h
index 8d9bdc4c9e..57db6e154f 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPoint.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPoint.h
@@ -14,6 +14,7 @@ namespace Web::Geometry {
 // https://drafts.fxtf.org/geometry/#DOMPoint
 class DOMPoint final : public DOMPointReadOnly {
     WEB_PLATFORM_OBJECT(DOMPoint, DOMPointReadOnly);
+    JS_DECLARE_ALLOCATOR(DOMPoint);
 
 public:
     static JS::NonnullGCPtr<DOMPoint> construct_impl(JS::Realm&, double x = 0, double y = 0, double z = 0, double w = 1);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp
index 5274819dfc..6759a214eb 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMPointReadOnly);
+
 JS::NonnullGCPtr<DOMPointReadOnly> DOMPointReadOnly::construct_impl(JS::Realm& realm, double x, double y, double z, double w)
 {
     return realm.heap().allocate<DOMPointReadOnly>(realm, realm, x, y, z, w);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h
index c4f17e50d8..1630af8cfd 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMPointReadOnly.h
@@ -23,6 +23,7 @@ struct DOMPointInit {
 // https://drafts.fxtf.org/geometry/#dompointreadonly
 class DOMPointReadOnly : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DOMPointReadOnly, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMPointReadOnly);
 
 public:
     static JS::NonnullGCPtr<DOMPointReadOnly> construct_impl(JS::Realm&, double x = 0, double y = 0, double z = 0, double w = 1);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMQuad.cpp b/Userland/Libraries/LibWeb/Geometry/DOMQuad.cpp
index 2a6e878f93..a6b93d4717 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMQuad.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMQuad.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMQuad);
+
 JS::NonnullGCPtr<DOMQuad> DOMQuad::construct_impl(JS::Realm& realm, DOMPointInit const& p1, DOMPointInit const& p2, DOMPointInit const& p3, DOMPointInit const& p4)
 {
     return realm.heap().allocate<DOMQuad>(realm, realm, p1, p2, p3, p4);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMQuad.h b/Userland/Libraries/LibWeb/Geometry/DOMQuad.h
index 33df0bfae9..686b2f7fa2 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMQuad.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMQuad.h
@@ -24,6 +24,7 @@ struct DOMQuadInit {
 // https://drafts.fxtf.org/geometry/#domquad
 class DOMQuad : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DOMQuad, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMQuad);
 
 public:
     static JS::NonnullGCPtr<DOMQuad> construct_impl(JS::Realm&, DOMPointInit const& p1, DOMPointInit const& p2, DOMPointInit const& p3, DOMPointInit const& p4);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRect.cpp b/Userland/Libraries/LibWeb/Geometry/DOMRect.cpp
index f11b6f1786..a0705f68e3 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRect.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRect.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMRect);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMRect>> DOMRect::construct_impl(JS::Realm& realm, double x, double y, double width, double height)
 {
     return create(realm, Gfx::FloatRect { x, y, width, height });
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRect.h b/Userland/Libraries/LibWeb/Geometry/DOMRect.h
index 4c41c866c4..f76e3876f1 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRect.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRect.h
@@ -13,6 +13,7 @@ namespace Web::Geometry {
 // https://drafts.fxtf.org/geometry/#DOMRect
 class DOMRect final : public DOMRectReadOnly {
     WEB_PLATFORM_OBJECT(DOMRect, DOMRectReadOnly);
+    JS_DECLARE_ALLOCATOR(DOMRect);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMRect>> construct_impl(JS::Realm&, double x = 0, double y = 0, double width = 0, double height = 0);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRectList.cpp b/Userland/Libraries/LibWeb/Geometry/DOMRectList.cpp
index 408ef10036..0fb23331a8 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRectList.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRectList.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMRectList);
+
 JS::NonnullGCPtr<DOMRectList> DOMRectList::create(JS::Realm& realm, Vector<JS::Handle<DOMRect>> rect_handles)
 {
     Vector<JS::NonnullGCPtr<DOMRect>> rects;
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRectList.h b/Userland/Libraries/LibWeb/Geometry/DOMRectList.h
index 7138518091..5efd84718e 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRectList.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRectList.h
@@ -16,6 +16,7 @@ namespace Web::Geometry {
 // https://drafts.fxtf.org/geometry-1/#DOMRectList
 class DOMRectList final : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(DOMRectList, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMRectList);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<DOMRectList> create(JS::Realm&, Vector<JS::Handle<DOMRect>>);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp
index 2487f652ee..f4cd848c2c 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Geometry {
 
+JS_DEFINE_ALLOCATOR(DOMRectReadOnly);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMRectReadOnly>> DOMRectReadOnly::construct_impl(JS::Realm& realm, double x, double y, double width, double height)
 {
     return realm.heap().allocate<DOMRectReadOnly>(realm, realm, x, y, width, height);
diff --git a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h
index 5c36caa0da..8d2a02cc61 100644
--- a/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h
+++ b/Userland/Libraries/LibWeb/Geometry/DOMRectReadOnly.h
@@ -23,6 +23,7 @@ struct DOMRectInit {
 // https://drafts.fxtf.org/geometry/#domrectreadonly
 class DOMRectReadOnly : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DOMRectReadOnly, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMRectReadOnly);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMRectReadOnly>> construct_impl(JS::Realm&, double x = 0, double y = 0, double width = 0, double height = 0);
diff --git a/Userland/Libraries/LibWeb/HTML/AudioTrack.cpp b/Userland/Libraries/LibWeb/HTML/AudioTrack.cpp
index 6a972a89a9..da8fe292ac 100644
--- a/Userland/Libraries/LibWeb/HTML/AudioTrack.cpp
+++ b/Userland/Libraries/LibWeb/HTML/AudioTrack.cpp
@@ -20,6 +20,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(AudioTrack);
+
 static IDAllocator s_audio_track_id_allocator;
 
 AudioTrack::AudioTrack(JS::Realm& realm, JS::NonnullGCPtr<HTMLMediaElement> media_element, NonnullRefPtr<Audio::Loader> loader)
diff --git a/Userland/Libraries/LibWeb/HTML/AudioTrack.h b/Userland/Libraries/LibWeb/HTML/AudioTrack.h
index 5ef35dd198..47823091e4 100644
--- a/Userland/Libraries/LibWeb/HTML/AudioTrack.h
+++ b/Userland/Libraries/LibWeb/HTML/AudioTrack.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 
 class AudioTrack final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(AudioTrack, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(AudioTrack);
 
 public:
     virtual ~AudioTrack() override;
diff --git a/Userland/Libraries/LibWeb/HTML/AudioTrackList.cpp b/Userland/Libraries/LibWeb/HTML/AudioTrackList.cpp
index 1c1124339d..62c014d768 100644
--- a/Userland/Libraries/LibWeb/HTML/AudioTrackList.cpp
+++ b/Userland/Libraries/LibWeb/HTML/AudioTrackList.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(AudioTrackList);
+
 AudioTrackList::AudioTrackList(JS::Realm& realm)
     : DOM::EventTarget(realm, MayInterfereWithIndexedPropertyAccess::Yes)
     , m_audio_tracks(realm.heap())
diff --git a/Userland/Libraries/LibWeb/HTML/AudioTrackList.h b/Userland/Libraries/LibWeb/HTML/AudioTrackList.h
index f52c8d53ff..1d69724c08 100644
--- a/Userland/Libraries/LibWeb/HTML/AudioTrackList.h
+++ b/Userland/Libraries/LibWeb/HTML/AudioTrackList.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 
 class AudioTrackList final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(AudioTrackList, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(AudioTrackList);
 
 public:
     ErrorOr<void> add_track(Badge<HTMLMediaElement>, JS::NonnullGCPtr<AudioTrack>);
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp b/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
index 640697520b..8dd14cffbd 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContext.cpp
@@ -37,6 +37,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(BrowsingContext);
+
 // https://html.spec.whatwg.org/multipage/urls-and-fetching.html#matches-about:blank
 bool url_matches_about_blank(AK::URL const& url)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContext.h b/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
index cf1fc7871e..e960072815 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContext.h
@@ -35,6 +35,7 @@ class BrowsingContext final
     : public AbstractBrowsingContext
     , public Weakable<BrowsingContext> {
     JS_CELL(BrowsingContext, AbstractBrowsingContext);
+    JS_DECLARE_ALLOCATOR(BrowsingContext);
 
 public:
     struct BrowsingContextAndDocument {
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.cpp b/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.cpp
index 63f10ec0c0..3987370b75 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.cpp
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(BrowsingContextGroup);
+
 // https://html.spec.whatwg.org/multipage/browsers.html#browsing-context-group-set
 static HashTable<JS::NonnullGCPtr<BrowsingContextGroup>>& user_agent_browsing_context_group_set()
 {
diff --git a/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.h b/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.h
index 7de8ddd588..0922be999a 100644
--- a/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.h
+++ b/Userland/Libraries/LibWeb/HTML/BrowsingContextGroup.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 
 class BrowsingContextGroup final : public JS::Cell {
     JS_CELL(BrowsingContextGroup, JS::Cell);
+    JS_DECLARE_ALLOCATOR(BrowsingContextGroup);
 
 public:
     struct BrowsingContextGroupAndDocument {
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasGradient.cpp b/Userland/Libraries/LibWeb/HTML/CanvasGradient.cpp
index 274276b1c6..28fd11d9ee 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasGradient.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CanvasGradient.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(CanvasGradient);
+
 // https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-createradialgradient
 WebIDL::ExceptionOr<JS::NonnullGCPtr<CanvasGradient>> CanvasGradient::create_radial(JS::Realm& realm, double x0, double y0, double r0, double x1, double y1, double r1)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasGradient.h b/Userland/Libraries/LibWeb/HTML/CanvasGradient.h
index 1329b19297..10e0ea4508 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasGradient.h
+++ b/Userland/Libraries/LibWeb/HTML/CanvasGradient.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 
 class CanvasGradient final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(CanvasGradient, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(CanvasGradient);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<CanvasGradient>> create_radial(JS::Realm&, double x0, double y0, double r0, double x1, double y1, double r1);
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasPattern.cpp b/Userland/Libraries/LibWeb/HTML/CanvasPattern.cpp
index 455b6db9a3..71be47be17 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasPattern.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CanvasPattern.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(CanvasPattern);
+
 void CanvasPatternPaintStyle::paint(Gfx::IntRect physical_bounding_box, PaintFunction paint) const
 {
     // 1. Create an infinite transparent black bitmap.
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasPattern.h b/Userland/Libraries/LibWeb/HTML/CanvasPattern.h
index a3a33288a0..592a619cf5 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasPattern.h
+++ b/Userland/Libraries/LibWeb/HTML/CanvasPattern.h
@@ -41,6 +41,7 @@ private:
 
 class CanvasPattern final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(CanvasPattern, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(CanvasPattern);
 
 public:
     static WebIDL::ExceptionOr<JS::GCPtr<CanvasPattern>> create(JS::Realm&, CanvasImageSource const& image, StringView repetition);
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
index f097fee535..eb042a1584 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp
@@ -26,6 +26,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(CanvasRenderingContext2D);
+
 JS::NonnullGCPtr<CanvasRenderingContext2D> CanvasRenderingContext2D::create(JS::Realm& realm, HTMLCanvasElement& element)
 {
     return realm.heap().allocate<CanvasRenderingContext2D>(realm, realm, element);
diff --git a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
index 7402c2c68e..bbffcf841c 100644
--- a/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
+++ b/Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h
@@ -58,6 +58,7 @@ class CanvasRenderingContext2D
     , public CanvasTextDrawingStyles<CanvasRenderingContext2D> {
 
     WEB_PLATFORM_OBJECT(CanvasRenderingContext2D, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(CanvasRenderingContext2D);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CanvasRenderingContext2D> create(JS::Realm&, HTMLCanvasElement&);
diff --git a/Userland/Libraries/LibWeb/HTML/CloseEvent.cpp b/Userland/Libraries/LibWeb/HTML/CloseEvent.cpp
index a839c14f54..681032b477 100644
--- a/Userland/Libraries/LibWeb/HTML/CloseEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CloseEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(CloseEvent);
+
 JS::NonnullGCPtr<CloseEvent> CloseEvent::create(JS::Realm& realm, FlyString const& event_name, CloseEventInit const& event_init)
 {
     return realm.heap().allocate<CloseEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/CloseEvent.h b/Userland/Libraries/LibWeb/HTML/CloseEvent.h
index d73ee04561..066a822136 100644
--- a/Userland/Libraries/LibWeb/HTML/CloseEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/CloseEvent.h
@@ -20,6 +20,7 @@ struct CloseEventInit : public DOM::EventInit {
 
 class CloseEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(CloseEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(CloseEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<CloseEvent> create(JS::Realm&, FlyString const& event_name, CloseEventInit const& event_init = {});
diff --git a/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementDefinition.h b/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementDefinition.h
index c12230f555..83fcb46a77 100644
--- a/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementDefinition.h
+++ b/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementDefinition.h
@@ -18,6 +18,7 @@ struct AlreadyConstructedCustomElementMarker {
 // https://html.spec.whatwg.org/multipage/custom-elements.html#custom-element-definition
 class CustomElementDefinition : public JS::Cell {
     JS_CELL(CustomElementDefinition, JS::Cell);
+    JS_DECLARE_ALLOCATOR(CustomElementDefinition);
 
     using LifecycleCallbacksStorage = OrderedHashMap<FlyString, JS::Handle<WebIDL::CallbackType>>;
     using ConstructionStackStorage = Vector<Variant<JS::Handle<DOM::Element>, AlreadyConstructedCustomElementMarker>>;
diff --git a/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.cpp b/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.cpp
index b13a100345..f8d363f6a7 100644
--- a/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.cpp
+++ b/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.cpp
@@ -20,6 +20,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(CustomElementDefinition);
+
 CustomElementRegistry::CustomElementRegistry(JS::Realm& realm)
     : Bindings::PlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.h b/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.h
index 98fd373c88..2107e14a14 100644
--- a/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.h
+++ b/Userland/Libraries/LibWeb/HTML/CustomElements/CustomElementRegistry.h
@@ -19,6 +19,7 @@ struct ElementDefinitionOptions {
 // https://html.spec.whatwg.org/multipage/custom-elements.html#customelementregistry
 class CustomElementRegistry : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(CustomElementRegistry, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(CustomElementRegistry);
 
 public:
     virtual ~CustomElementRegistry() override;
diff --git a/Userland/Libraries/LibWeb/HTML/DOMParser.cpp b/Userland/Libraries/LibWeb/HTML/DOMParser.cpp
index 57c446fb99..768f85105a 100644
--- a/Userland/Libraries/LibWeb/HTML/DOMParser.cpp
+++ b/Userland/Libraries/LibWeb/HTML/DOMParser.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(DOMParser);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMParser>> DOMParser::construct_impl(JS::Realm& realm)
 {
     return realm.heap().allocate<DOMParser>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/DOMParser.h b/Userland/Libraries/LibWeb/HTML/DOMParser.h
index ca0775d7bb..7bd2dc69db 100644
--- a/Userland/Libraries/LibWeb/HTML/DOMParser.h
+++ b/Userland/Libraries/LibWeb/HTML/DOMParser.h
@@ -17,6 +17,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#domparser
 class DOMParser final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DOMParser, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMParser);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<DOMParser>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/DOMStringMap.cpp b/Userland/Libraries/LibWeb/HTML/DOMStringMap.cpp
index 96758c65fb..051fbcbd9b 100644
--- a/Userland/Libraries/LibWeb/HTML/DOMStringMap.cpp
+++ b/Userland/Libraries/LibWeb/HTML/DOMStringMap.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(DOMStringMap);
+
 JS::NonnullGCPtr<DOMStringMap> DOMStringMap::create(DOM::Element& element)
 {
     auto& realm = element.realm();
diff --git a/Userland/Libraries/LibWeb/HTML/DOMStringMap.h b/Userland/Libraries/LibWeb/HTML/DOMStringMap.h
index b28a245340..8f37a44aa0 100644
--- a/Userland/Libraries/LibWeb/HTML/DOMStringMap.h
+++ b/Userland/Libraries/LibWeb/HTML/DOMStringMap.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/dom.html#domstringmap
 class DOMStringMap final : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(DOMStringMap, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMStringMap);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<DOMStringMap> create(DOM::Element&);
diff --git a/Userland/Libraries/LibWeb/HTML/DocumentState.cpp b/Userland/Libraries/LibWeb/HTML/DocumentState.cpp
index 0bc1c586f4..8c360081c4 100644
--- a/Userland/Libraries/LibWeb/HTML/DocumentState.cpp
+++ b/Userland/Libraries/LibWeb/HTML/DocumentState.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(DocumentState);
+
 DocumentState::DocumentState() = default;
 
 DocumentState::~DocumentState() = default;
diff --git a/Userland/Libraries/LibWeb/HTML/DocumentState.h b/Userland/Libraries/LibWeb/HTML/DocumentState.h
index 854a0bad64..275e2dbd0d 100644
--- a/Userland/Libraries/LibWeb/HTML/DocumentState.h
+++ b/Userland/Libraries/LibWeb/HTML/DocumentState.h
@@ -21,6 +21,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#document-state-2
 class DocumentState final : public JS::Cell {
     JS_CELL(DocumentState, JS::Cell);
+    JS_DECLARE_ALLOCATOR(DocumentState);
 
 public:
     struct NestedHistory {
diff --git a/Userland/Libraries/LibWeb/HTML/ErrorEvent.cpp b/Userland/Libraries/LibWeb/HTML/ErrorEvent.cpp
index bc244491b7..ff6507c55d 100644
--- a/Userland/Libraries/LibWeb/HTML/ErrorEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/ErrorEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(ErrorEvent);
+
 JS::NonnullGCPtr<ErrorEvent> ErrorEvent::create(JS::Realm& realm, FlyString const& event_name, ErrorEventInit const& event_init)
 {
     return realm.heap().allocate<ErrorEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/ErrorEvent.h b/Userland/Libraries/LibWeb/HTML/ErrorEvent.h
index cb4208ed60..d5d7642c10 100644
--- a/Userland/Libraries/LibWeb/HTML/ErrorEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/ErrorEvent.h
@@ -23,6 +23,7 @@ struct ErrorEventInit : public DOM::EventInit {
 // https://html.spec.whatwg.org/multipage/webappapis.html#errorevent
 class ErrorEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(ErrorEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(ErrorEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ErrorEvent> create(JS::Realm&, FlyString const& event_name, ErrorEventInit const& = {});
diff --git a/Userland/Libraries/LibWeb/HTML/EventHandler.cpp b/Userland/Libraries/LibWeb/HTML/EventHandler.cpp
index e6d5b26b7f..bcc31d6cce 100644
--- a/Userland/Libraries/LibWeb/HTML/EventHandler.cpp
+++ b/Userland/Libraries/LibWeb/HTML/EventHandler.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(EventHandler);
+
 EventHandler::EventHandler(DeprecatedString s)
     : value(move(s))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/EventHandler.h b/Userland/Libraries/LibWeb/HTML/EventHandler.h
index 2af98558fb..9e7374386e 100644
--- a/Userland/Libraries/LibWeb/HTML/EventHandler.h
+++ b/Userland/Libraries/LibWeb/HTML/EventHandler.h
@@ -9,12 +9,14 @@
 #include <AK/DeprecatedString.h>
 #include <AK/Variant.h>
 #include <LibJS/Heap/Cell.h>
+#include <LibJS/Heap/CellAllocator.h>
 #include <LibWeb/WebIDL/CallbackType.h>
 
 namespace Web::HTML {
 
 class EventHandler final : public JS::Cell {
     JS_CELL(EventHandler, JS::Cell);
+    JS_DECLARE_ALLOCATOR(EventHandler);
 
 public:
     explicit EventHandler(DeprecatedString);
diff --git a/Userland/Libraries/LibWeb/HTML/FormDataEvent.cpp b/Userland/Libraries/LibWeb/HTML/FormDataEvent.cpp
index 8504a4abe5..f1740aabb6 100644
--- a/Userland/Libraries/LibWeb/HTML/FormDataEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/FormDataEvent.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(FormDataEvent);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<FormDataEvent>> FormDataEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, FormDataEventInit const& event_init)
 {
     return realm.heap().allocate<FormDataEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/FormDataEvent.h b/Userland/Libraries/LibWeb/HTML/FormDataEvent.h
index e983278d69..da526f2554 100644
--- a/Userland/Libraries/LibWeb/HTML/FormDataEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/FormDataEvent.h
@@ -17,6 +17,7 @@ struct FormDataEventInit : public DOM::EventInit {
 
 class FormDataEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(FormDataEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(FormDataEvent);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<FormDataEvent>> construct_impl(JS::Realm&, FlyString const& event_name, FormDataEventInit const& event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.cpp
index cf9f59fbdf..ce0dfc0cc4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLAnchorElement);
+
 HTMLAnchorElement::HTMLAnchorElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.h b/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.h
index ac541012ef..da49e6fc2d 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.h
@@ -15,6 +15,7 @@ class HTMLAnchorElement final
     : public HTMLElement
     , public HTMLHyperlinkElementUtils {
     WEB_PLATFORM_OBJECT(HTMLAnchorElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLAnchorElement);
 
 public:
     virtual ~HTMLAnchorElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.cpp
index d5da4e8549..c11ca5fb17 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLAreaElement);
+
 HTMLAreaElement::HTMLAreaElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.h b/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.h
index 4a3835adda..55a4335ccd 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLAreaElement.h
@@ -16,6 +16,7 @@ class HTMLAreaElement final
     : public HTMLElement
     , public HTMLHyperlinkElementUtils {
     WEB_PLATFORM_OBJECT(HTMLAreaElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLAreaElement);
 
 public:
     virtual ~HTMLAreaElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.cpp
index a67faf89b8..237c9e29f1 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLAudioElement);
+
 HTMLAudioElement::HTMLAudioElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLMediaElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.h b/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.h
index 5ed8065100..b171e0d506 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLAudioElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLAudioElement final : public HTMLMediaElement {
     WEB_PLATFORM_OBJECT(HTMLAudioElement, HTMLMediaElement);
+    JS_DECLARE_ALLOCATOR(HTMLAudioElement);
 
 public:
     virtual ~HTMLAudioElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBRElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLBRElement.cpp
index a13ae96957..1271fb40f4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBRElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBRElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLBRElement);
+
 HTMLBRElement::HTMLBRElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBRElement.h b/Userland/Libraries/LibWeb/HTML/HTMLBRElement.h
index 221474262f..c432f3a5d5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBRElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBRElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLBRElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLBRElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLBRElement);
 
 public:
     virtual ~HTMLBRElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
index 400d5ffd23..9b9232162d 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLBaseElement);
+
 HTMLBaseElement::HTMLBaseElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
index 2fb6ea056c..9186008ad3 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLBaseElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLBaseElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLBaseElement);
 
 public:
     virtual ~HTMLBaseElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.cpp
index 2395c0a753..4702a99e13 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLBodyElement);
+
 HTMLBodyElement::HTMLBodyElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.h b/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.h
index 9931128eed..870a5aa41c 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBodyElement.h
@@ -16,6 +16,7 @@ class HTMLBodyElement final
     : public HTMLElement
     , public WindowEventHandlers {
     WEB_PLATFORM_OBJECT(HTMLBodyElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLBodyElement);
 
 public:
     virtual ~HTMLBodyElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.cpp
index 6f4828c7d2..04bfe8bdfb 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLButtonElement);
+
 HTMLButtonElement::HTMLButtonElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.h b/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.h
index 94327c49bd..7c27b8cc6f 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLButtonElement.h
@@ -21,6 +21,7 @@ class HTMLButtonElement final
     : public HTMLElement
     , public FormAssociatedElement {
     WEB_PLATFORM_OBJECT(HTMLButtonElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLButtonElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLButtonElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
index ee1ccf2b13..1044f9fe2e 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp
@@ -26,6 +26,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLCanvasElement);
+
 static constexpr auto max_canvas_area = 16384 * 16384;
 
 HTMLCanvasElement::HTMLCanvasElement(DOM::Document& document, DOM::QualifiedName qualified_name)
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
index a46629bd31..e8a9ab75b5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 
 class HTMLCanvasElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLCanvasElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLCanvasElement);
 
 public:
     using RenderingContext = Variant<JS::Handle<CanvasRenderingContext2D>, JS::Handle<WebGL::WebGLRenderingContext>, Empty>;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDListElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDListElement.cpp
index eed2efc709..2bb0033777 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDListElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDListElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLDListElement);
+
 HTMLDListElement::HTMLDListElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDListElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDListElement.h
index d0c1dbdd8e..3047149bdf 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDListElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDListElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLDListElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDListElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDListElement);
 
 public:
     virtual ~HTMLDListElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDataElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDataElement.cpp
index 0ec6a42b80..265817ee54 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDataElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDataElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLDataElement);
+
 HTMLDataElement::HTMLDataElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDataElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDataElement.h
index a00a29c11c..5d5b65cbe9 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDataElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDataElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLDataElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDataElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDataElement);
 
 public:
     virtual ~HTMLDataElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDataListElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDataListElement.h
index dc30ea2e46..f910c707a0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDataListElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDataListElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLDataListElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDataListElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDataListElement);
 
 public:
     virtual ~HTMLDataListElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp
index 1943a9ddba..b411502d7f 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp
@@ -19,6 +19,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLDetailsElement);
+
 HTMLDetailsElement::HTMLDetailsElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.h
index 74b4dddcb0..0f18522475 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDetailsElement.h
@@ -17,6 +17,7 @@ namespace Web::HTML {
 
 class HTMLDetailsElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDetailsElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDetailsElement);
 
 public:
     virtual ~HTMLDetailsElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
index 9c154d2e12..e3c352a700 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLDialogElement);
+
 HTMLDialogElement::HTMLDialogElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.h
index 0553db3f6d..1780e3a604 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDialogElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLDialogElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDialogElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDialogElement);
 
 public:
     virtual ~HTMLDialogElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.cpp
index 7e76c9ee3c..8764cd34f7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLDirectoryElement);
+
 HTMLDirectoryElement::HTMLDirectoryElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.h
index fd53d1dc37..936915856d 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDirectoryElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // NOTE: This element is marked as obsolete, but is still listed as required by the specification.
 class HTMLDirectoryElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDirectoryElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDirectoryElement);
 
 public:
     virtual ~HTMLDirectoryElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDivElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDivElement.cpp
index eee88d7693..5267db7eac 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDivElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDivElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLDivElement);
+
 HTMLDivElement::HTMLDivElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDivElement.h b/Userland/Libraries/LibWeb/HTML/HTMLDivElement.h
index 4d63f4f754..c28a8afe06 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDivElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDivElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLDivElement : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLDivElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLDivElement);
 
 public:
     virtual ~HTMLDivElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDocument.cpp b/Userland/Libraries/LibWeb/HTML/HTMLDocument.cpp
index 76288d2779..8ead3df8d1 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDocument.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDocument.cpp
@@ -8,6 +8,8 @@
 
 namespace Web::HTML {
 
+JS_DECLARE_ALLOCATOR(HTMLDocument);
+
 HTMLDocument::HTMLDocument(JS::Realm& realm, AK::URL const& url)
     : Document(realm, url)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLDocument.h b/Userland/Libraries/LibWeb/HTML/HTMLDocument.h
index 32d65a3ab4..465f931ae2 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLDocument.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLDocument.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 //       https://github.com/whatwg/dom/issues/221
 class HTMLDocument final : public DOM::Document {
     JS_CELL(HTMLDocument, DOM::Document);
+    JS_DECLARE_ALLOCATOR(HTMLDocument);
 
 public:
     virtual ~HTMLDocument() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
index 90395257a7..3993f1de23 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
@@ -36,6 +36,8 @@
 
 namespace Web::HTML {
 
+JS_DECLARE_ALLOCATOR(HTMLElement);
+
 HTMLElement::HTMLElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : Element(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLElement.h b/Userland/Libraries/LibWeb/HTML/HTMLElement.h
index d8ea326332..5a734947f4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLElement.h
@@ -23,6 +23,7 @@ class HTMLElement
     : public DOM::Element
     , public HTML::GlobalEventHandlers {
     WEB_PLATFORM_OBJECT(HTMLElement, DOM::Element);
+    JS_DECLARE_ALLOCATOR(HTMLElement);
 
 public:
     virtual ~HTMLElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.cpp
index 7ba220f5c1..06d7b5e0b6 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLEmbedElement);
+
 HTMLEmbedElement::HTMLEmbedElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.h b/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.h
index 311ad16d3a..bc0f540629 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLEmbedElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLEmbedElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLEmbedElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLEmbedElement);
 
 public:
     virtual ~HTMLEmbedElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.cpp
index 59297ca6cc..36bff7c53c 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLFieldSetElement);
+
 HTMLFieldSetElement::HTMLFieldSetElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.h b/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.h
index f69b9a77c4..bcdde471d4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFieldSetElement.h
@@ -16,6 +16,7 @@ class HTMLFieldSetElement final
     : public HTMLElement
     , public FormAssociatedElement {
     WEB_PLATFORM_OBJECT(HTMLFieldSetElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLFieldSetElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLFieldSetElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFontElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFontElement.cpp
index a104339c04..7ca976c4f3 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFontElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFontElement.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLFontElement);
+
 HTMLFontElement::HTMLFontElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFontElement.h b/Userland/Libraries/LibWeb/HTML/HTMLFontElement.h
index 89a3b0783d..aec3676d89 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFontElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFontElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLFontElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLFontElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLFontElement);
 
 public:
     virtual ~HTMLFontElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
index f417c07c4f..5c594dc75a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
@@ -31,6 +31,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLFormElement);
+
 HTMLFormElement::HTMLFormElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.h b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.h
index 4bb4aa0006..346cdd5ec8 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFormElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFormElement.h
@@ -30,6 +30,7 @@ namespace Web::HTML {
 
 class HTMLFormElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLFormElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLFormElement);
 
 public:
     virtual ~HTMLFormElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
index 3256104e30..30b0383c61 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLFrameElement);
+
 HTMLFrameElement::HTMLFrameElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.h b/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.h
index ab36507102..5e236c8dbc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFrameElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // NOTE: This element is marked as obsolete, but is still listed as required by the specification.
 class HTMLFrameElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLFrameElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLFrameElement);
 
 public:
     virtual ~HTMLFrameElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.cpp
index 1250398a24..e88c8c9ad0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLFrameSetElement);
+
 HTMLFrameSetElement::HTMLFrameSetElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.h b/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.h
index 6f7d8fda89..2afcf99b62 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLFrameSetElement.h
@@ -16,6 +16,7 @@ class HTMLFrameSetElement final
     : public HTMLElement
     , public WindowEventHandlers {
     WEB_PLATFORM_OBJECT(HTMLFrameSetElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLFrameSetElement);
 
 public:
     virtual ~HTMLFrameSetElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHRElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLHRElement.cpp
index f97a7814f8..98b8e6acce 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHRElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHRElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLHRElement);
+
 HTMLHRElement::HTMLHRElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHRElement.h b/Userland/Libraries/LibWeb/HTML/HTMLHRElement.h
index d907b83673..17b8f9da4a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHRElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHRElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLHRElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLHRElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLHRElement);
 
 public:
     virtual ~HTMLHRElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.cpp
index ff17191036..4bebe15d54 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLHeadElement);
+
 HTMLHeadElement::HTMLHeadElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.h b/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.h
index 6d88ab8034..6383da1d70 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHeadElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLHeadElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLHeadElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLHeadElement);
 
 public:
     virtual ~HTMLHeadElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.cpp
index 8d6d1ab858..f9928287f5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLHeadingElement);
+
 HTMLHeadingElement::HTMLHeadingElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.h b/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.h
index f2b9ec905f..8827a05b80 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHeadingElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLHeadingElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLHeadingElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLHeadingElement);
 
 public:
     virtual ~HTMLHeadingElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.cpp
index a9f97601cc..2e9b67e2f7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLHtmlElement);
+
 HTMLHtmlElement::HTMLHtmlElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.h b/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.h
index 0ab5bd2cf6..677f294800 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLHtmlElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLHtmlElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLHtmlElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLHtmlElement);
 
 public:
     virtual ~HTMLHtmlElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
index 2dff0eebd9..0f43e7c6fc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLIFrameElement);
+
 HTMLIFrameElement::HTMLIFrameElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : NavigableContainer(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.h b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.h
index 662c502544..d15e9bbfdc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLIFrameElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLIFrameElement final : public NavigableContainer {
     WEB_PLATFORM_OBJECT(HTMLIFrameElement, NavigableContainer);
+    JS_DECLARE_ALLOCATOR(HTMLIFrameElement);
 
 public:
     virtual ~HTMLIFrameElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp
index c6babd1fcb..3c042ab81f 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.cpp
@@ -33,6 +33,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLImageElement);
+
 HTMLImageElement::HTMLImageElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.h b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.h
index f682e14474..e60aedd32b 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLImageElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLImageElement.h
@@ -27,6 +27,7 @@ class HTMLImageElement final
     , public Layout::ImageProvider
     , public DOM::Document::ViewportClient {
     WEB_PLATFORM_OBJECT(HTMLImageElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLImageElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLImageElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp
index c2bab657b5..4d3996903a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.cpp
@@ -32,6 +32,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLInputElement);
+
 HTMLInputElement::HTMLInputElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
     , m_value(DeprecatedString::empty())
@@ -499,6 +501,7 @@ Optional<DeprecatedString> HTMLInputElement::placeholder_value() const
 
 class PlaceholderElement final : public HTMLDivElement {
     JS_CELL(PlaceholderElement, HTMLDivElement);
+    JS_DECLARE_ALLOCATOR(PlaceholderElement);
 
 public:
     PlaceholderElement(DOM::Document& document)
@@ -508,6 +511,8 @@ public:
     virtual Optional<CSS::Selector::PseudoElement> pseudo_element() const override { return CSS::Selector::PseudoElement::Placeholder; }
 };
 
+JS_DEFINE_ALLOCATOR(PlaceholderElement);
+
 void HTMLInputElement::create_shadow_tree_if_needed()
 {
     if (shadow_root_internal())
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.h b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.h
index 9d1c1797fd..ac38766eb7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLInputElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLInputElement.h
@@ -45,6 +45,7 @@ class HTMLInputElement final
     , public FormAssociatedElement
     , public DOM::EditableTextNodeOwner {
     WEB_PLATFORM_OBJECT(HTMLInputElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLInputElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLInputElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLIElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLLIElement.cpp
index 41cf0533e6..bfdaffd7c1 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLIElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLIElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLLIElement);
+
 HTMLLIElement::HTMLLIElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLIElement.h b/Userland/Libraries/LibWeb/HTML/HTMLLIElement.h
index d7a5a00c26..a18db4aa56 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLIElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLIElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLLIElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLLIElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLLIElement);
 
 public:
     virtual ~HTMLLIElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.cpp
index 6d8372bf23..e73966fae5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLLabelElement);
+
 HTMLLabelElement::HTMLLabelElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.h b/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.h
index 41e018d311..5b47a9cda8 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLabelElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLLabelElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLLabelElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLLabelElement);
 
 public:
     virtual ~HTMLLabelElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.cpp
index dd004bc08d..99f383d781 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLLegendElement);
+
 HTMLLegendElement::HTMLLegendElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.h b/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.h
index dc10820eda..a54a833920 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLegendElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLLegendElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLLegendElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLLegendElement);
 
 public:
     virtual ~HTMLLegendElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
index cd50ca2da2..54c1149dc5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
@@ -30,6 +30,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLLinkElement);
+
 HTMLLinkElement::HTMLLinkElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.h b/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.h
index cb3b02e1ee..20f824c185 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLLinkElement.h
@@ -22,6 +22,7 @@ class HTMLLinkElement final
     : public HTMLElement
     , public ResourceClient {
     WEB_PLATFORM_OBJECT(HTMLLinkElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLLinkElement);
 
 public:
     virtual ~HTMLLinkElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMapElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMapElement.cpp
index ebcfa407b3..7cc0e41aa7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMapElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMapElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLMapElement);
+
 HTMLMapElement::HTMLMapElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMapElement.h b/Userland/Libraries/LibWeb/HTML/HTMLMapElement.h
index c862ba7cc1..088b63da28 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMapElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMapElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLMapElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLMapElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLMapElement);
 
 public:
     virtual ~HTMLMapElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp
index 73e63b01c7..9c0b2c4984 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLMarqueeElement);
+
 HTMLMarqueeElement::HTMLMarqueeElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h
index 3c85d41bc2..343f5e1621 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // NOTE: This element is marked as obsolete, but is still listed as required by the specification.
 class HTMLMarqueeElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLMarqueeElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLMarqueeElement);
 
 public:
     virtual ~HTMLMarqueeElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMediaElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
index c1dc519054..c9d599ea55 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
@@ -553,6 +553,7 @@ enum class SelectMode {
 
 class SourceElementSelector final : public JS::Cell {
     JS_CELL(SourceElementSelector, JS::Cell);
+    JS_DECLARE_ALLOCATOR(SourceElementSelector);
 
 public:
     SourceElementSelector(JS::NonnullGCPtr<HTMLMediaElement> media_element, JS::NonnullGCPtr<HTMLSourceElement> candidate)
@@ -727,6 +728,8 @@ private:
     JS::GCPtr<DOM::Node> m_previously_failed_candidate;
 };
 
+JS_DEFINE_ALLOCATOR(SourceElementSelector);
+
 void HTMLMediaElement::children_changed()
 {
     if (m_source_element_selector)
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.cpp
index b4b7575005..0d90bc01c2 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLMenuElement);
+
 HTMLMenuElement::HTMLMenuElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.h b/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.h
index 90e0e612ee..0d10ab3b17 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMenuElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLMenuElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLMenuElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLMenuElement);
 
 public:
     virtual ~HTMLMenuElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
index 12bd3c2a0a..aa7c8ff5da 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
@@ -17,6 +17,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLMetaElement);
+
 HTMLMetaElement::HTMLMetaElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.h b/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.h
index 2f8492e715..eb017170c4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMetaElement.h
@@ -23,6 +23,7 @@ namespace Web::HTML {
 
 class HTMLMetaElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLMetaElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLMetaElement);
 
 public:
     virtual ~HTMLMetaElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.cpp
index 6f8ce5e8fa..b51ab80f8a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLMeterElement);
+
 HTMLMeterElement::HTMLMeterElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.h b/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.h
index d8bf2a74f6..6bc108ff18 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLMeterElement.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 
 class HTMLMeterElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLMeterElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLMeterElement);
 
 public:
     virtual ~HTMLMeterElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLModElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLModElement.cpp
index e41f8e1163..d8c5e01b5c 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLModElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLModElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLModElement);
+
 HTMLModElement::HTMLModElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLModElement.h b/Userland/Libraries/LibWeb/HTML/HTMLModElement.h
index 956ab1bc89..fbc513013e 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLModElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLModElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLModElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLModElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLModElement);
 
 public:
     virtual ~HTMLModElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOListElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLOListElement.cpp
index 74de79aa2b..31a2b4c1cb 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOListElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOListElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLOListElement);
+
 HTMLOListElement::HTMLOListElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOListElement.h b/Userland/Libraries/LibWeb/HTML/HTMLOListElement.h
index b09347beb7..7f1bb32b3a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOListElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOListElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLOListElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLOListElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLOListElement);
 
 public:
     virtual ~HTMLOListElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
index cb7de1f1d5..123f8abd48 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.cpp
@@ -19,6 +19,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLObjectElement);
+
 HTMLObjectElement::HTMLObjectElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : NavigableContainer(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.h b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.h
index 6ed05588bd..dbc7eabb26 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.h
@@ -22,6 +22,7 @@ class HTMLObjectElement final
     , public ResourceClient
     , public Layout::ImageProvider {
     WEB_PLATFORM_OBJECT(HTMLObjectElement, NavigableContainer)
+    JS_DECLARE_ALLOCATOR(HTMLObjectElement);
     FORM_ASSOCIATED_ELEMENT(NavigableContainer, HTMLObjectElement)
 
     enum class Representation {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.cpp
index 77c433c961..3685f195a0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLOptGroupElement);
+
 HTMLOptGroupElement::HTMLOptGroupElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.h b/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.h
index d982df677a..4149e0dbd0 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOptGroupElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLOptGroupElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLOptGroupElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLOptGroupElement);
 
 public:
     virtual ~HTMLOptGroupElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.cpp
index f72898bdc5..b0bc40be5a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLOptionElement);
+
 HTMLOptionElement::HTMLOptionElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.h b/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.h
index 2f85bff6a5..5f85725707 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOptionElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLOptionElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLOptionElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLOptionElement);
 
 public:
     virtual ~HTMLOptionElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.cpp b/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.cpp
index 43270097d4..079009ac32 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLOptionsCollection);
+
 JS::NonnullGCPtr<HTMLOptionsCollection> HTMLOptionsCollection::create(DOM::ParentNode& root, Function<bool(DOM::Element const&)> filter)
 {
     return root.heap().allocate<HTMLOptionsCollection>(root.realm(), root, move(filter));
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.h b/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.h
index f990acb2b0..f871902aaa 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOptionsCollection.h
@@ -17,6 +17,7 @@ using HTMLElementOrElementIndex = Variant<JS::Handle<HTMLElement>, i32>;
 
 class HTMLOptionsCollection final : public DOM::HTMLCollection {
     WEB_PLATFORM_OBJECT(HTMLOptionsCollection, DOM::HTMLCollection);
+    JS_DECLARE_ALLOCATOR(HTMLOptionsCollection);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<HTMLOptionsCollection> create(DOM::ParentNode& root, Function<bool(DOM::Element const&)> filter);
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
index 99a9d89ba9..52caee575d 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLOutputElement);
+
 HTMLOutputElement::HTMLOutputElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h
index f6b582a08f..ba0bbefa70 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLOutputElement.h
@@ -17,6 +17,7 @@ class HTMLOutputElement final
     : public HTMLElement
     , public FormAssociatedElement {
     WEB_PLATFORM_OBJECT(HTMLOutputElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLOutputElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLOutputElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.cpp
index 3b560b656a..834a56065a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLParagraphElement);
+
 HTMLParagraphElement::HTMLParagraphElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.h b/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.h
index 3ca8789dcf..9dcc51a7aa 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLParagraphElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLParagraphElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLParagraphElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLParagraphElement);
 
 public:
     virtual ~HTMLParagraphElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLParamElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLParamElement.cpp
index b71bdbaed9..3e0986b787 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLParamElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLParamElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLParamElement);
+
 HTMLParamElement::HTMLParamElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLParamElement.h b/Userland/Libraries/LibWeb/HTML/HTMLParamElement.h
index 8ae224061a..0cc46ad388 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLParamElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLParamElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLParamElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLParamElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLParamElement);
 
 public:
     virtual ~HTMLParamElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.cpp
index d9e4bb99a5..9a59392ad5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLPictureElement);
+
 HTMLPictureElement::HTMLPictureElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.h b/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.h
index c27e99ee34..125d8c21cb 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLPictureElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLPictureElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLPictureElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLPictureElement);
 
 public:
     virtual ~HTMLPictureElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLPreElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLPreElement.cpp
index f24a94c110..1ad31eab81 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLPreElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLPreElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLPreElement);
+
 HTMLPreElement::HTMLPreElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLPreElement.h b/Userland/Libraries/LibWeb/HTML/HTMLPreElement.h
index 2d1c5fdce9..97ae40f888 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLPreElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLPreElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLPreElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLPreElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLPreElement);
 
 public:
     virtual ~HTMLPreElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.cpp
index e1164f5e0a..deb499fcf4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLProgressElement);
+
 HTMLProgressElement::HTMLProgressElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.h b/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.h
index 418e904d81..6d68acf8e5 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLProgressElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLProgressElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLProgressElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLProgressElement);
 
 public:
     virtual ~HTMLProgressElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.cpp
index 2d0995df83..5bd1f219cd 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLQuoteElement);
+
 HTMLQuoteElement::HTMLQuoteElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.h b/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.h
index 2941e06213..a7cd188eaf 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLQuoteElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLQuoteElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLQuoteElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLQuoteElement);
 
 public:
     virtual ~HTMLQuoteElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp
index 95b599eaf4..a75313cbe1 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.cpp
@@ -23,6 +23,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLScriptElement);
+
 HTMLScriptElement::HTMLScriptElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h
index efc79312d3..edbb324b25 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLScriptElement.h
@@ -17,6 +17,7 @@ namespace Web::HTML {
 
 class HTMLScriptElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLScriptElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLScriptElement);
 
 public:
     virtual ~HTMLScriptElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
index 1ac80c500e..35d37b2c80 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLSelectElement);
+
 HTMLSelectElement::HTMLSelectElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
index e670bfe241..a12d02d852 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h
@@ -18,6 +18,7 @@ class HTMLSelectElement final
     : public HTMLElement
     , public FormAssociatedElement {
     WEB_PLATFORM_OBJECT(HTMLSelectElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLSelectElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLSelectElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.cpp
index c1928b9de2..a0bf9d1434 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLSlotElement);
+
 HTMLSlotElement::HTMLSlotElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.h
index d468c86a67..a540a025fc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSlotElement.h
@@ -24,6 +24,7 @@ class HTMLSlotElement final
     : public HTMLElement
     , public DOM::Slot {
     WEB_PLATFORM_OBJECT(HTMLSlotElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLSlotElement);
 
 public:
     virtual ~HTMLSlotElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.cpp
index 76f994aced..88a61d44b2 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLSourceElement);
+
 HTMLSourceElement::HTMLSourceElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.h
index bc8d1b7374..a57d29cc6c 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSourceElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLSourceElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLSourceElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLSourceElement);
 
 public:
     virtual ~HTMLSourceElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.cpp
index dd5559e20c..4cf8baba26 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLSpanElement);
+
 HTMLSpanElement::HTMLSpanElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.h
index 0b7eacb2da..27f60d4d84 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSpanElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLSpanElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLSpanElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLSpanElement);
 
 public:
     virtual ~HTMLSpanElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
index 020ac97c92..e6376884a4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLStyleElement);
+
 HTMLStyleElement::HTMLStyleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.h b/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.h
index 21e6f6e313..69d6e17503 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLStyleElement.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 
 class HTMLStyleElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLStyleElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLStyleElement);
 
 public:
     virtual ~HTMLStyleElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.cpp
index f0d0b710e9..6e72fe544e 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLSummaryElement);
+
 HTMLSummaryElement::HTMLSummaryElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.h b/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.h
index 7676d86e44..991ed728bc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLSummaryElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLSummaryElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLSummaryElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLSummaryElement);
 
 public:
     virtual ~HTMLSummaryElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.cpp
index 2d9f245abb..9ff0567baf 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTableCaptionElement);
+
 HTMLTableCaptionElement::HTMLTableCaptionElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.h
index 1d954a7176..aece874c29 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableCaptionElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLTableCaptionElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTableCaptionElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTableCaptionElement);
 
 public:
     virtual ~HTMLTableCaptionElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.cpp
index 9c7f8d6e41..973f8a8bf7 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.cpp
@@ -19,6 +19,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTableCellElement);
+
 HTMLTableCellElement::HTMLTableCellElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.h
index f389070a2d..64fa43eb61 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableCellElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLTableCellElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTableCellElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTableCellElement);
 
 public:
     virtual ~HTMLTableCellElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.cpp
index 06e94dd8b6..11c331d1e4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTableColElement);
+
 HTMLTableColElement::HTMLTableColElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.h
index 6b4a0f1da9..589d03849e 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableColElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLTableColElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTableColElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTableColElement);
 
 public:
     virtual ~HTMLTableColElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
index be2e88718f..0be2befb8b 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableElement.cpp
@@ -21,6 +21,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTableElement);
+
 HTMLTableElement::HTMLTableElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTableElement.h
index e13736ea5a..36888a78fa 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableElement.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 
 class HTMLTableElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTableElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTableElement);
 
 public:
     virtual ~HTMLTableElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.cpp
index f07f16aa0c..2c1bfc68c8 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.cpp
@@ -20,6 +20,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTableRowElement);
+
 HTMLTableRowElement::HTMLTableRowElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.h
index a9888e5db7..9d7ad96389 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLTableRowElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTableRowElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTableRowElement);
 
 public:
     virtual ~HTMLTableRowElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.cpp
index 7a39e25366..8821a72d5c 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTableSectionElement);
+
 HTMLTableSectionElement::HTMLTableSectionElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.h
index 7fd1c651f0..1cc3569f42 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTableSectionElement.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 
 class HTMLTableSectionElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTableSectionElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTableSectionElement);
 
 public:
     virtual ~HTMLTableSectionElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.cpp
index d5fd2b15b8..72a73520a1 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTemplateElement);
+
 HTMLTemplateElement::HTMLTemplateElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.h
index 2c22e19480..8bb39991fa 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTemplateElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLTemplateElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTemplateElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTemplateElement);
 
 public:
     virtual ~HTMLTemplateElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTextAreaElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTextAreaElement.h
index 96b4f11ebc..aba64f05c4 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTextAreaElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTextAreaElement.h
@@ -19,6 +19,7 @@ class HTMLTextAreaElement final
     , public FormAssociatedElement
     , public DOM::EditableTextNodeOwner {
     WEB_PLATFORM_OBJECT(HTMLTextAreaElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTextAreaElement);
     FORM_ASSOCIATED_ELEMENT(HTMLElement, HTMLTextAreaElement)
 
 public:
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.cpp
index 77692b083d..519fab1368 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTimeElement);
+
 HTMLTimeElement::HTMLTimeElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.h
index 21ed86e2e3..d94199c2ad 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTimeElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLTimeElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTimeElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTimeElement);
 
 public:
     virtual ~HTMLTimeElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp
index 89a8e2b633..e588f61052 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTitleElement);
+
 HTMLTitleElement::HTMLTitleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.h
index 545b24b6f3..b0c4dc42dc 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTitleElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLTitleElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTitleElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTitleElement);
 
 public:
     virtual ~HTMLTitleElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.cpp
index 286d94b73a..f7714540df 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLTrackElement);
+
 HTMLTrackElement::HTMLTrackElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.h b/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.h
index 17be218974..de203d1a13 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLTrackElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLTrackElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLTrackElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLTrackElement);
 
 public:
     virtual ~HTMLTrackElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLUListElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLUListElement.cpp
index 04e1fd451c..436edf2f42 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLUListElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLUListElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLUListElement);
+
 HTMLUListElement::HTMLUListElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLUListElement.h b/Userland/Libraries/LibWeb/HTML/HTMLUListElement.h
index bf36a3621d..7dd426212b 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLUListElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLUListElement.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class HTMLUListElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLUListElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLUListElement);
 
 public:
     virtual ~HTMLUListElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.cpp
index ae683a1b35..cc7bedbb42 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLUnknownElement);
+
 HTMLUnknownElement::HTMLUnknownElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.h b/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.h
index 9e46892771..6dd1e692a6 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLUnknownElement.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class HTMLUnknownElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLUnknownElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLUnknownElement);
 
 public:
     virtual ~HTMLUnknownElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.cpp b/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.cpp
index 71e6eaa453..16e9ba0a0a 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.cpp
+++ b/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.cpp
@@ -20,6 +20,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLVideoElement);
+
 HTMLVideoElement::HTMLVideoElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLMediaElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.h b/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.h
index 4856ea319d..9c707cb5fa 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLVideoElement.h
@@ -22,6 +22,7 @@ struct VideoFrame {
 
 class HTMLVideoElement final : public HTMLMediaElement {
     WEB_PLATFORM_OBJECT(HTMLVideoElement, HTMLMediaElement);
+    JS_DECLARE_ALLOCATOR(HTMLVideoElement);
 
 public:
     virtual ~HTMLVideoElement() override;
diff --git a/Userland/Libraries/LibWeb/HTML/History.cpp b/Userland/Libraries/LibWeb/HTML/History.cpp
index 6b6c11c2ab..383c27f845 100644
--- a/Userland/Libraries/LibWeb/HTML/History.cpp
+++ b/Userland/Libraries/LibWeb/HTML/History.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(History);
+
 JS::NonnullGCPtr<History> History::create(JS::Realm& realm, DOM::Document& document)
 {
     return realm.heap().allocate<History>(realm, realm, document);
diff --git a/Userland/Libraries/LibWeb/HTML/History.h b/Userland/Libraries/LibWeb/HTML/History.h
index 699f64e4ec..90b3897c5a 100644
--- a/Userland/Libraries/LibWeb/HTML/History.h
+++ b/Userland/Libraries/LibWeb/HTML/History.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 
 class History final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(History, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(History);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<History> create(JS::Realm&, DOM::Document&);
diff --git a/Userland/Libraries/LibWeb/HTML/ImageData.cpp b/Userland/Libraries/LibWeb/HTML/ImageData.cpp
index c2ed6887b2..cf898df419 100644
--- a/Userland/Libraries/LibWeb/HTML/ImageData.cpp
+++ b/Userland/Libraries/LibWeb/HTML/ImageData.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(ImageData);
+
 JS::GCPtr<ImageData> ImageData::create_with_size(JS::Realm& realm, int width, int height)
 {
 
diff --git a/Userland/Libraries/LibWeb/HTML/ImageData.h b/Userland/Libraries/LibWeb/HTML/ImageData.h
index 86c25ce578..6fb3837898 100644
--- a/Userland/Libraries/LibWeb/HTML/ImageData.h
+++ b/Userland/Libraries/LibWeb/HTML/ImageData.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class ImageData final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ImageData, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ImageData);
 
 public:
     static JS::GCPtr<ImageData> create_with_size(JS::Realm&, int width, int height);
diff --git a/Userland/Libraries/LibWeb/HTML/ImageRequest.cpp b/Userland/Libraries/LibWeb/HTML/ImageRequest.cpp
index 7763009ce7..36614186c6 100644
--- a/Userland/Libraries/LibWeb/HTML/ImageRequest.cpp
+++ b/Userland/Libraries/LibWeb/HTML/ImageRequest.cpp
@@ -19,6 +19,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(ImageRequest);
+
 JS::NonnullGCPtr<ImageRequest> ImageRequest::create(JS::Realm& realm, Page& page)
 {
     return realm.heap().allocate<ImageRequest>(realm, page);
diff --git a/Userland/Libraries/LibWeb/HTML/ImageRequest.h b/Userland/Libraries/LibWeb/HTML/ImageRequest.h
index bdb28e5a37..1406a0ce67 100644
--- a/Userland/Libraries/LibWeb/HTML/ImageRequest.h
+++ b/Userland/Libraries/LibWeb/HTML/ImageRequest.h
@@ -19,6 +19,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/images.html#image-request
 class ImageRequest final : public JS::Cell {
     JS_CELL(ImageRequest, JS::Cell);
+    JS_DECLARE_ALLOCATOR(ImageRequest);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ImageRequest> create(JS::Realm&, Page&);
diff --git a/Userland/Libraries/LibWeb/HTML/Location.cpp b/Userland/Libraries/LibWeb/HTML/Location.cpp
index 927ded2612..29cbcdaa4c 100644
--- a/Userland/Libraries/LibWeb/HTML/Location.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Location.cpp
@@ -22,6 +22,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Location);
+
 // https://html.spec.whatwg.org/multipage/history.html#the-location-interface
 Location::Location(JS::Realm& realm)
     : PlatformObject(realm, MayInterfereWithIndexedPropertyAccess::Yes)
diff --git a/Userland/Libraries/LibWeb/HTML/Location.h b/Userland/Libraries/LibWeb/HTML/Location.h
index 19667aba6e..814be11a76 100644
--- a/Userland/Libraries/LibWeb/HTML/Location.h
+++ b/Userland/Libraries/LibWeb/HTML/Location.h
@@ -19,6 +19,7 @@ namespace Web::HTML {
 
 class Location final : public Bindings::PlatformObject {
     JS_OBJECT(Location, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Location);
 
 public:
     virtual ~Location() override;
diff --git a/Userland/Libraries/LibWeb/HTML/MediaError.cpp b/Userland/Libraries/LibWeb/HTML/MediaError.cpp
index d65888d3d5..be133741d7 100644
--- a/Userland/Libraries/LibWeb/HTML/MediaError.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MediaError.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(MediaError);
+
 MediaError::MediaError(JS::Realm& realm, Code code, String message)
     : Base(realm)
     , m_code(code)
diff --git a/Userland/Libraries/LibWeb/HTML/MediaError.h b/Userland/Libraries/LibWeb/HTML/MediaError.h
index 388ea74598..c8f16f17d2 100644
--- a/Userland/Libraries/LibWeb/HTML/MediaError.h
+++ b/Userland/Libraries/LibWeb/HTML/MediaError.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 
 class MediaError final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(MediaError, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(MediaError);
 
 public:
     enum class Code : u16 {
diff --git a/Userland/Libraries/LibWeb/HTML/MessageChannel.cpp b/Userland/Libraries/LibWeb/HTML/MessageChannel.cpp
index 3f2a689863..7a838c5686 100644
--- a/Userland/Libraries/LibWeb/HTML/MessageChannel.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MessageChannel.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(MessageChannel);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<MessageChannel>> MessageChannel::construct_impl(JS::Realm& realm)
 {
     return realm.heap().allocate<MessageChannel>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/MessageChannel.h b/Userland/Libraries/LibWeb/HTML/MessageChannel.h
index b347bee3ee..2a1c086b3c 100644
--- a/Userland/Libraries/LibWeb/HTML/MessageChannel.h
+++ b/Userland/Libraries/LibWeb/HTML/MessageChannel.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/web-messaging.html#message-channels
 class MessageChannel final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(MessageChannel, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(MessageChannel);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<MessageChannel>> construct_impl(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/MessageEvent.cpp b/Userland/Libraries/LibWeb/HTML/MessageEvent.cpp
index f34d27fe59..f0ab0d5c5e 100644
--- a/Userland/Libraries/LibWeb/HTML/MessageEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MessageEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(MessageEvent);
+
 JS::NonnullGCPtr<MessageEvent> MessageEvent::create(JS::Realm& realm, FlyString const& event_name, MessageEventInit const& event_init)
 {
     return realm.heap().allocate<MessageEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/MessageEvent.h b/Userland/Libraries/LibWeb/HTML/MessageEvent.h
index f6bd432baf..d4077ee9ff 100644
--- a/Userland/Libraries/LibWeb/HTML/MessageEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/MessageEvent.h
@@ -24,6 +24,7 @@ struct MessageEventInit : public DOM::EventInit {
 
 class MessageEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(MessageEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(MessageEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MessageEvent> create(JS::Realm&, FlyString const& event_name, MessageEventInit const& = {});
diff --git a/Userland/Libraries/LibWeb/HTML/MessagePort.cpp b/Userland/Libraries/LibWeb/HTML/MessagePort.cpp
index 790a8c5858..db659c15ad 100644
--- a/Userland/Libraries/LibWeb/HTML/MessagePort.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MessagePort.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(MessagePort);
+
 JS::NonnullGCPtr<MessagePort> MessagePort::create(JS::Realm& realm)
 {
     return realm.heap().allocate<MessagePort>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/MessagePort.h b/Userland/Libraries/LibWeb/HTML/MessagePort.h
index 7d5784d340..b079ea08f2 100644
--- a/Userland/Libraries/LibWeb/HTML/MessagePort.h
+++ b/Userland/Libraries/LibWeb/HTML/MessagePort.h
@@ -25,6 +25,7 @@ struct StructuredSerializeOptions {
 // https://html.spec.whatwg.org/multipage/web-messaging.html#message-ports
 class MessagePort final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(MessagePort, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(MessagePort);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MessagePort> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/MimeType.cpp b/Userland/Libraries/LibWeb/HTML/MimeType.cpp
index 725307078f..c61b1badeb 100644
--- a/Userland/Libraries/LibWeb/HTML/MimeType.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MimeType.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(MimeType);
+
 MimeType::MimeType(JS::Realm& realm, String type)
     : Bindings::PlatformObject(realm)
     , m_type(move(type))
diff --git a/Userland/Libraries/LibWeb/HTML/MimeType.h b/Userland/Libraries/LibWeb/HTML/MimeType.h
index ab507a3a3c..059dad5a18 100644
--- a/Userland/Libraries/LibWeb/HTML/MimeType.h
+++ b/Userland/Libraries/LibWeb/HTML/MimeType.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/system-state.html#mimetype
 class MimeType : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(MimeType, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(MimeType);
 
 public:
     virtual ~MimeType() override;
diff --git a/Userland/Libraries/LibWeb/HTML/MimeTypeArray.cpp b/Userland/Libraries/LibWeb/HTML/MimeTypeArray.cpp
index 7800119769..30a998925c 100644
--- a/Userland/Libraries/LibWeb/HTML/MimeTypeArray.cpp
+++ b/Userland/Libraries/LibWeb/HTML/MimeTypeArray.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(MimeTypeArray);
+
 MimeTypeArray::MimeTypeArray(JS::Realm& realm)
     : Bindings::LegacyPlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/MimeTypeArray.h b/Userland/Libraries/LibWeb/HTML/MimeTypeArray.h
index 58ab56c1a2..c5fc228cc6 100644
--- a/Userland/Libraries/LibWeb/HTML/MimeTypeArray.h
+++ b/Userland/Libraries/LibWeb/HTML/MimeTypeArray.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/system-state.html#mimetypearray
 class MimeTypeArray : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(MimeTypeArray, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(MimeTypeArray);
 
 public:
     virtual ~MimeTypeArray() override;
diff --git a/Userland/Libraries/LibWeb/HTML/Navigable.cpp b/Userland/Libraries/LibWeb/HTML/Navigable.cpp
index c7484ee06d..10986354fe 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigable.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Navigable.cpp
@@ -35,8 +35,11 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Navigable);
+
 class ResponseHolder : public JS::Cell {
     JS_CELL(ResponseHolder, JS::Cell);
+    JS_DECLARE_ALLOCATOR(ResponseHolder);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ResponseHolder> create(JS::VM& vm)
@@ -56,6 +59,8 @@ private:
     JS::GCPtr<Fetch::Infrastructure::Response> m_response;
 };
 
+JS_DEFINE_ALLOCATOR(ResponseHolder);
+
 HashTable<Navigable*>& all_navigables()
 {
     static HashTable<Navigable*> set;
diff --git a/Userland/Libraries/LibWeb/HTML/Navigable.h b/Userland/Libraries/LibWeb/HTML/Navigable.h
index 3541ca862d..0f4ab7a852 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigable.h
+++ b/Userland/Libraries/LibWeb/HTML/Navigable.h
@@ -46,6 +46,7 @@ struct TargetSnapshotParams {
 // https://html.spec.whatwg.org/multipage/document-sequences.html#navigable
 class Navigable : public JS::Cell {
     JS_CELL(Navigable, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Navigable);
 
 public:
     virtual ~Navigable() override;
diff --git a/Userland/Libraries/LibWeb/HTML/NavigateEvent.cpp b/Userland/Libraries/LibWeb/HTML/NavigateEvent.cpp
index 22126fd4bf..6948c54a23 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigateEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigateEvent.cpp
@@ -23,6 +23,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(NavigateEvent);
+
 JS::NonnullGCPtr<NavigateEvent> NavigateEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, NavigateEventInit const& event_init)
 {
     return realm.heap().allocate<NavigateEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigateEvent.h b/Userland/Libraries/LibWeb/HTML/NavigateEvent.h
index 4749b3e0ab..0f8fcee078 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigateEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigateEvent.h
@@ -40,6 +40,7 @@ struct NavigationInterceptOptions {
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigateevent
 class NavigateEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(NavigateEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(NavigateEvent);
 
 public:
     // https://html.spec.whatwg.org/multipage/nav-history-apis.html#concept-navigateevent-interception-state
diff --git a/Userland/Libraries/LibWeb/HTML/Navigation.cpp b/Userland/Libraries/LibWeb/HTML/Navigation.cpp
index 121354475b..70cc62db67 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigation.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Navigation.cpp
@@ -29,6 +29,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Navigation);
+
 static NavigationResult navigation_api_method_tracker_derived_result(JS::NonnullGCPtr<NavigationAPIMethodTracker> api_method_tracker);
 
 NavigationAPIMethodTracker::NavigationAPIMethodTracker(JS::NonnullGCPtr<Navigation> navigation,
diff --git a/Userland/Libraries/LibWeb/HTML/Navigation.h b/Userland/Libraries/LibWeb/HTML/Navigation.h
index 3952256ee8..bdcb6a6418 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigation.h
+++ b/Userland/Libraries/LibWeb/HTML/Navigation.h
@@ -70,6 +70,7 @@ struct NavigationAPIMethodTracker final : public JS::Cell {
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigation-interface
 class Navigation : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(Navigation, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(Navigation);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Navigation> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.cpp b/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.cpp
index 1f478a06f9..e7a2cf19f5 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(NavigationCurrentEntryChangeEvent);
+
 JS::NonnullGCPtr<NavigationCurrentEntryChangeEvent> NavigationCurrentEntryChangeEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, NavigationCurrentEntryChangeEventInit const& event_init)
 {
     return realm.heap().allocate<NavigationCurrentEntryChangeEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.h b/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.h
index 530c4d9d5a..8351a26c79 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigationCurrentEntryChangeEvent.h
@@ -18,6 +18,7 @@ struct NavigationCurrentEntryChangeEventInit : public DOM::EventInit {
 
 class NavigationCurrentEntryChangeEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(NavigationCurrentEntryChangeEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(NavigationCurrentEntryChangeEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NavigationCurrentEntryChangeEvent> construct_impl(JS::Realm&, FlyString const& event_name, NavigationCurrentEntryChangeEventInit const&);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationDestination.cpp b/Userland/Libraries/LibWeb/HTML/NavigationDestination.cpp
index 8f25d67edb..b6059bf098 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationDestination.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigationDestination.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(NavigationDestination);
+
 JS::NonnullGCPtr<NavigationDestination> NavigationDestination::create(JS::Realm& realm)
 {
     return realm.heap().allocate<NavigationDestination>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationDestination.h b/Userland/Libraries/LibWeb/HTML/NavigationDestination.h
index af3e436f91..e01b17b812 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationDestination.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigationDestination.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigationdestination
 class NavigationDestination : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(NavigationDestination, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(NavigationDestination);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NavigationDestination> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.cpp b/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.cpp
index 40838e5c52..1b29a8ff93 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(NavigationHistoryEntry);
+
 JS::NonnullGCPtr<NavigationHistoryEntry> NavigationHistoryEntry::create(JS::Realm& realm, JS::NonnullGCPtr<SessionHistoryEntry> she)
 {
     return realm.heap().allocate<NavigationHistoryEntry>(realm, realm, she);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.h b/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.h
index 2297bb1881..5651e423ce 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigationHistoryEntry.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigationhistoryentry
 class NavigationHistoryEntry : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(NavigationHistoryEntry, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(NavigationHistoryEntry);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NavigationHistoryEntry> create(JS::Realm&, JS::NonnullGCPtr<SessionHistoryEntry>);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationTransition.cpp b/Userland/Libraries/LibWeb/HTML/NavigationTransition.cpp
index f7173a5148..e574fd09eb 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationTransition.cpp
+++ b/Userland/Libraries/LibWeb/HTML/NavigationTransition.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(NavigationTransition);
+
 JS::NonnullGCPtr<NavigationTransition> NavigationTransition::create(JS::Realm& realm, Bindings::NavigationType navigation_type, JS::NonnullGCPtr<NavigationHistoryEntry> from_entry, JS::GCPtr<JS::Promise> finished_promise)
 {
     return realm.heap().allocate<NavigationTransition>(realm, realm, navigation_type, from_entry, finished_promise);
diff --git a/Userland/Libraries/LibWeb/HTML/NavigationTransition.h b/Userland/Libraries/LibWeb/HTML/NavigationTransition.h
index ae7f7575d9..b049b8b838 100644
--- a/Userland/Libraries/LibWeb/HTML/NavigationTransition.h
+++ b/Userland/Libraries/LibWeb/HTML/NavigationTransition.h
@@ -14,6 +14,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigationtransition
 class NavigationTransition : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(NavigationTransition, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(NavigationTransition);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<NavigationTransition> create(JS::Realm&, Bindings::NavigationType, JS::NonnullGCPtr<NavigationHistoryEntry>, JS::GCPtr<JS::Promise>);
diff --git a/Userland/Libraries/LibWeb/HTML/Navigator.cpp b/Userland/Libraries/LibWeb/HTML/Navigator.cpp
index 5c5029a854..9c19f1a3dd 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigator.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Navigator.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Navigator);
+
 JS::NonnullGCPtr<Navigator> Navigator::create(JS::Realm& realm)
 {
     return realm.heap().allocate<Navigator>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/Navigator.h b/Userland/Libraries/LibWeb/HTML/Navigator.h
index a89539d068..d25d11b683 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigator.h
+++ b/Userland/Libraries/LibWeb/HTML/Navigator.h
@@ -24,6 +24,7 @@ class Navigator : public Bindings::PlatformObject
     , public NavigatorLanguageMixin
     , public NavigatorOnLineMixin {
     WEB_PLATFORM_OBJECT(Navigator, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Navigator);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Navigator> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp
index c035476171..c042754b21 100644
--- a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(PageTransitionEvent);
+
 JS::NonnullGCPtr<PageTransitionEvent> PageTransitionEvent::create(JS::Realm& realm, FlyString const& event_name, PageTransitionEventInit const& event_init)
 {
     return realm.heap().allocate<PageTransitionEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
index a8f5634c73..514d4f54f7 100644
--- a/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/PageTransitionEvent.h
@@ -17,6 +17,7 @@ struct PageTransitionEventInit : public DOM::EventInit {
 
 class PageTransitionEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(PageTransitionEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(PageTransitionEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<PageTransitionEvent> create(JS::Realm&, FlyString const& event_name, PageTransitionEventInit const&);
diff --git a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
index 9e43f1b29e..299576b908 100644
--- a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.cpp
@@ -44,6 +44,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(HTMLParser);
+
 static inline void log_parse_error(SourceLocation const& location = SourceLocation::current())
 {
     dbgln_if(HTML_PARSER_DEBUG, "Parse error! {}", location);
diff --git a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.h b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.h
index 50e1ff6883..9f9c3e2e5f 100644
--- a/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.h
+++ b/Userland/Libraries/LibWeb/HTML/Parser/HTMLParser.h
@@ -42,6 +42,7 @@ namespace Web::HTML {
 
 class HTMLParser final : public JS::Cell {
     JS_CELL(HTMLParser, JS::Cell);
+    JS_DECLARE_ALLOCATOR(HTMLParser);
 
     friend class HTMLTokenizer;
 
diff --git a/Userland/Libraries/LibWeb/HTML/Path2D.cpp b/Userland/Libraries/LibWeb/HTML/Path2D.cpp
index f36c716da8..44988cb331 100644
--- a/Userland/Libraries/LibWeb/HTML/Path2D.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Path2D.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Path2D);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Path2D>> Path2D::construct_impl(JS::Realm& realm, Optional<Variant<JS::Handle<Path2D>, String>> const& path)
 {
     return realm.heap().allocate<Path2D>(realm, realm, path);
diff --git a/Userland/Libraries/LibWeb/HTML/Path2D.h b/Userland/Libraries/LibWeb/HTML/Path2D.h
index 1ec158a101..e944bcf874 100644
--- a/Userland/Libraries/LibWeb/HTML/Path2D.h
+++ b/Userland/Libraries/LibWeb/HTML/Path2D.h
@@ -20,6 +20,7 @@ class Path2D final
     , public CanvasPath {
 
     WEB_PLATFORM_OBJECT(Path2D, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Path2D);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Path2D>> construct_impl(JS::Realm&, Optional<Variant<JS::Handle<Path2D>, String>> const& path);
diff --git a/Userland/Libraries/LibWeb/HTML/Plugin.cpp b/Userland/Libraries/LibWeb/HTML/Plugin.cpp
index a774ce26ce..49c5996a1d 100644
--- a/Userland/Libraries/LibWeb/HTML/Plugin.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Plugin.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Plugin);
+
 Plugin::Plugin(JS::Realm& realm, String name)
     : Bindings::LegacyPlatformObject(realm)
     , m_name(move(name))
diff --git a/Userland/Libraries/LibWeb/HTML/Plugin.h b/Userland/Libraries/LibWeb/HTML/Plugin.h
index 64df6de112..c4e58e8c57 100644
--- a/Userland/Libraries/LibWeb/HTML/Plugin.h
+++ b/Userland/Libraries/LibWeb/HTML/Plugin.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/system-state.html#dom-plugin
 class Plugin : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(Plugin, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(Plugin);
 
 public:
     virtual ~Plugin() override;
diff --git a/Userland/Libraries/LibWeb/HTML/PluginArray.cpp b/Userland/Libraries/LibWeb/HTML/PluginArray.cpp
index 92c1478ecf..7633ee3b3f 100644
--- a/Userland/Libraries/LibWeb/HTML/PluginArray.cpp
+++ b/Userland/Libraries/LibWeb/HTML/PluginArray.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(PluginArray);
+
 PluginArray::PluginArray(JS::Realm& realm)
     : Bindings::LegacyPlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/PluginArray.h b/Userland/Libraries/LibWeb/HTML/PluginArray.h
index d1f1afb9a7..4ebeed1beb 100644
--- a/Userland/Libraries/LibWeb/HTML/PluginArray.h
+++ b/Userland/Libraries/LibWeb/HTML/PluginArray.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/system-state.html#pluginarray
 class PluginArray : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(PluginArray, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(PluginArray);
 
 public:
     virtual ~PluginArray() override;
diff --git a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp
index bbe4f7bcd1..1f6c124593 100644
--- a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(PromiseRejectionEvent);
+
 JS::NonnullGCPtr<PromiseRejectionEvent> PromiseRejectionEvent::create(JS::Realm& realm, FlyString const& event_name, PromiseRejectionEventInit const& event_init)
 {
     return realm.heap().allocate<PromiseRejectionEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h
index 2edcae286d..f77a62a42e 100644
--- a/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/PromiseRejectionEvent.h
@@ -22,6 +22,7 @@ struct PromiseRejectionEventInit : public DOM::EventInit {
 
 class PromiseRejectionEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(PromiseRejectionEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(PromiseRejectionEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<PromiseRejectionEvent> create(JS::Realm&, FlyString const& event_name, PromiseRejectionEventInit const& = {});
diff --git a/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.cpp b/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.cpp
index 44956a1912..fc9058124c 100644
--- a/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.cpp
+++ b/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.cpp
@@ -8,6 +8,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(RemoteBrowsingContext);
+
 JS::NonnullGCPtr<RemoteBrowsingContext> RemoteBrowsingContext::create_a_new_remote_browsing_context(String handle)
 {
     auto browsing_context = Bindings::main_thread_vm().heap().allocate_without_realm<RemoteBrowsingContext>(handle);
diff --git a/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.h b/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.h
index 4d980b0ae6..f1872fe912 100644
--- a/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.h
+++ b/Userland/Libraries/LibWeb/HTML/RemoteBrowsingContext.h
@@ -15,6 +15,7 @@ class RemoteBrowsingContext final
     : public AbstractBrowsingContext
     , public Weakable<RemoteBrowsingContext> {
     JS_CELL(RemoteBrowsingContext, AbstractBrowsingContext);
+    JS_DECLARE_ALLOCATOR(RemoteBrowsingContext);
 
 public:
     static JS::NonnullGCPtr<RemoteBrowsingContext> create_a_new_remote_browsing_context(String handle);
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.cpp
index 44916f0227..2f498a10ad 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(ClassicScript);
+
 // https://html.spec.whatwg.org/multipage/webappapis.html#creating-a-classic-script
 JS::NonnullGCPtr<ClassicScript> ClassicScript::create(DeprecatedString filename, StringView source, EnvironmentSettingsObject& environment_settings_object, AK::URL base_url, size_t source_line_number, MutedErrors muted_errors)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.h b/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.h
index d45800db02..8935baece9 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/ClassicScript.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/webappapis.html#classic-script
 class ClassicScript final : public Script {
     JS_CELL(ClassicScript, Script);
+    JS_DECLARE_ALLOCATOR(ClassicScript);
 
 public:
     virtual ~ClassicScript() override;
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.cpp
index a2f7c549b7..ccf28f998d 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.cpp
@@ -8,6 +8,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(ModuleMap);
+
 void ModuleMap::visit_edges(Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.h b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.h
index 366c66d830..7cf5e53dd5 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleMap.h
@@ -37,6 +37,7 @@ private:
 // https://html.spec.whatwg.org/multipage/webappapis.html#module-map
 class ModuleMap final : public JS::Cell {
     JS_CELL(ModuleMap, Cell);
+    JS_DECLARE_ALLOCATOR(ModuleMap);
 
 public:
     ModuleMap() = default;
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.cpp
index 70b1310529..ec1de5b116 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(JavaScriptModuleScript);
+
 ModuleScript::~ModuleScript() = default;
 
 ModuleScript::ModuleScript(AK::URL base_url, DeprecatedString filename, EnvironmentSettingsObject& environment_settings_object)
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.h b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.h
index 543a232b51..b2a42373e2 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/ModuleScript.h
@@ -24,6 +24,7 @@ protected:
 
 class JavaScriptModuleScript final : public ModuleScript {
     JS_CELL(JavaScriptModuleScript, ModuleScript);
+    JS_DECLARE_ALLOCATOR(JavaScriptModuleScript);
 
 public:
     virtual ~JavaScriptModuleScript() override;
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/Script.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/Script.cpp
index 65c0d56de2..4f1fae97bc 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/Script.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/Script.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Script);
+
 Script::Script(AK::URL base_url, DeprecatedString filename, EnvironmentSettingsObject& environment_settings_object)
     : m_base_url(move(base_url))
     , m_filename(move(filename))
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/Script.h b/Userland/Libraries/LibWeb/HTML/Scripting/Script.h
index 7ebec520dc..dd8a042bc2 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/Script.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/Script.h
@@ -18,6 +18,7 @@ class Script
     : public JS::Cell
     , public JS::Script::HostDefined {
     JS_CELL(Script, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Script);
 
 public:
     virtual ~Script() override;
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp
index dae9498b5c..e05e71e460 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WindowEnvironmentSettingsObject);
+
 WindowEnvironmentSettingsObject::WindowEnvironmentSettingsObject(Window& window, NonnullOwnPtr<JS::ExecutionContext> execution_context)
     : EnvironmentSettingsObject(move(execution_context))
     , m_window(window)
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h
index da0ae20905..2217ec0388 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WindowEnvironmentSettingsObject.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class WindowEnvironmentSettingsObject final : public EnvironmentSettingsObject {
     JS_CELL(WindowEnvironmentSettingsObject, EnvironmentSettingsObject);
+    JS_DECLARE_ALLOCATOR(WindowEnvironmentSettingsObject);
 
 public:
     static void setup(AK::URL const& creation_url, NonnullOwnPtr<JS::ExecutionContext>, Optional<Environment>, AK::URL top_level_creation_url, Origin top_level_origin);
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp
index b73b3b2550..78e6e9e738 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WorkerEnvironmentSettingsObject);
+
 JS::NonnullGCPtr<WorkerEnvironmentSettingsObject> WorkerEnvironmentSettingsObject::setup(NonnullOwnPtr<JS::ExecutionContext> execution_context /* FIXME: null or an environment reservedEnvironment, a URL topLevelCreationURL, and an origin topLevelOrigin */)
 {
     auto realm = execution_context->realm;
diff --git a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
index 245009ce40..ba7d9f6d84 100644
--- a/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
+++ b/Userland/Libraries/LibWeb/HTML/Scripting/WorkerEnvironmentSettingsObject.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 class WorkerEnvironmentSettingsObject final
     : public EnvironmentSettingsObject {
     JS_CELL(WindowEnvironmentSettingsObject, EnvironmentSettingsObject);
+    JS_DECLARE_ALLOCATOR(WorkerEnvironmentSettingsObject);
 
 public:
     WorkerEnvironmentSettingsObject(NonnullOwnPtr<JS::ExecutionContext> execution_context, JS::NonnullGCPtr<WorkerGlobalScope> global_scope)
diff --git a/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.cpp b/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.cpp
index f5b4fc9440..eafaa5c9b6 100644
--- a/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.cpp
+++ b/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(SessionHistoryEntry);
+
 void SessionHistoryEntry::visit_edges(Cell::Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.h b/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.h
index 1a859e1377..0c9feb4f3d 100644
--- a/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.h
+++ b/Userland/Libraries/LibWeb/HTML/SessionHistoryEntry.h
@@ -30,6 +30,7 @@ enum class ScrollRestorationMode {
 // https://html.spec.whatwg.org/multipage/history.html#session-history-entry
 struct SessionHistoryEntry final : public JS::Cell {
     JS_CELL(SessionHistoryEntry, JS::Cell);
+    JS_DECLARE_ALLOCATOR(SessionHistoryEntry);
 
     SessionHistoryEntry();
 
diff --git a/Userland/Libraries/LibWeb/HTML/SharedImageRequest.cpp b/Userland/Libraries/LibWeb/HTML/SharedImageRequest.cpp
index 3e47ba3e9c..97aef9dff9 100644
--- a/Userland/Libraries/LibWeb/HTML/SharedImageRequest.cpp
+++ b/Userland/Libraries/LibWeb/HTML/SharedImageRequest.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(SharedImageRequest);
+
 JS::NonnullGCPtr<SharedImageRequest> SharedImageRequest::get_or_create(JS::Realm& realm, Page& page, AK::URL const& url)
 {
     auto document = Bindings::host_defined_environment_settings_object(realm).responsible_document();
diff --git a/Userland/Libraries/LibWeb/HTML/SharedImageRequest.h b/Userland/Libraries/LibWeb/HTML/SharedImageRequest.h
index 39af3b17d8..f66f4a04fb 100644
--- a/Userland/Libraries/LibWeb/HTML/SharedImageRequest.h
+++ b/Userland/Libraries/LibWeb/HTML/SharedImageRequest.h
@@ -19,6 +19,7 @@ namespace Web::HTML {
 
 class SharedImageRequest : public JS::Cell {
     JS_CELL(ImageRequest, JS::Cell);
+    JS_DECLARE_ALLOCATOR(SharedImageRequest);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<SharedImageRequest> get_or_create(JS::Realm&, Page&, AK::URL const&);
diff --git a/Userland/Libraries/LibWeb/HTML/Storage.cpp b/Userland/Libraries/LibWeb/HTML/Storage.cpp
index e681043d84..fb37675c77 100644
--- a/Userland/Libraries/LibWeb/HTML/Storage.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Storage.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Storage);
+
 JS::NonnullGCPtr<Storage> Storage::create(JS::Realm& realm)
 {
     return realm.heap().allocate<Storage>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/Storage.h b/Userland/Libraries/LibWeb/HTML/Storage.h
index 382953c908..b9a961767b 100644
--- a/Userland/Libraries/LibWeb/HTML/Storage.h
+++ b/Userland/Libraries/LibWeb/HTML/Storage.h
@@ -15,6 +15,7 @@ namespace Web::HTML {
 
 class Storage : public Bindings::LegacyPlatformObject {
     WEB_PLATFORM_OBJECT(Storage, Bindings::LegacyPlatformObject);
+    JS_DECLARE_ALLOCATOR(Storage);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Storage> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp b/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
index 74f591dbda..08907a66df 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(SubmitEvent);
+
 JS::NonnullGCPtr<SubmitEvent> SubmitEvent::create(JS::Realm& realm, FlyString const& event_name, SubmitEventInit const& event_init)
 {
     return realm.heap().allocate<SubmitEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/SubmitEvent.h b/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
index a37775a560..ff4db0a5d0 100644
--- a/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/SubmitEvent.h
@@ -17,6 +17,7 @@ struct SubmitEventInit : public DOM::EventInit {
 
 class SubmitEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(SubmitEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(SubmitEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<SubmitEvent> create(JS::Realm&, FlyString const& event_name, SubmitEventInit const& event_init);
diff --git a/Userland/Libraries/LibWeb/HTML/TextMetrics.cpp b/Userland/Libraries/LibWeb/HTML/TextMetrics.cpp
index e520a0c01e..0ae748109f 100644
--- a/Userland/Libraries/LibWeb/HTML/TextMetrics.cpp
+++ b/Userland/Libraries/LibWeb/HTML/TextMetrics.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(TextMetrics);
+
 JS::NonnullGCPtr<TextMetrics> TextMetrics::create(JS::Realm& realm)
 {
     return realm.heap().allocate<TextMetrics>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/HTML/TextMetrics.h b/Userland/Libraries/LibWeb/HTML/TextMetrics.h
index fe4b96d05e..4c392e701a 100644
--- a/Userland/Libraries/LibWeb/HTML/TextMetrics.h
+++ b/Userland/Libraries/LibWeb/HTML/TextMetrics.h
@@ -12,6 +12,7 @@ namespace Web::HTML {
 
 class TextMetrics : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TextMetrics, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TextMetrics);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<TextMetrics> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/TimeRanges.cpp b/Userland/Libraries/LibWeb/HTML/TimeRanges.cpp
index 37d7217c3d..52aa9fcf5a 100644
--- a/Userland/Libraries/LibWeb/HTML/TimeRanges.cpp
+++ b/Userland/Libraries/LibWeb/HTML/TimeRanges.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(TimeRanges);
+
 TimeRanges::TimeRanges(JS::Realm& realm)
     : Base(realm)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/TimeRanges.h b/Userland/Libraries/LibWeb/HTML/TimeRanges.h
index 01714b36a2..bf4e3d4bbe 100644
--- a/Userland/Libraries/LibWeb/HTML/TimeRanges.h
+++ b/Userland/Libraries/LibWeb/HTML/TimeRanges.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 
 class TimeRanges final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TimeRanges, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TimeRanges);
 
 public:
     size_t length() const;
diff --git a/Userland/Libraries/LibWeb/HTML/Timer.cpp b/Userland/Libraries/LibWeb/HTML/Timer.cpp
index 2edf3869c2..d2e79ec64d 100644
--- a/Userland/Libraries/LibWeb/HTML/Timer.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Timer.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Timer);
+
 JS::NonnullGCPtr<Timer> Timer::create(JS::Object& window_or_worker_global_scope, i32 milliseconds, Function<void()> callback, i32 id)
 {
     auto heap_function_callback = JS::create_heap_function(window_or_worker_global_scope.heap(), move(callback));
diff --git a/Userland/Libraries/LibWeb/HTML/Timer.h b/Userland/Libraries/LibWeb/HTML/Timer.h
index 5ea7fe3e4d..c507349149 100644
--- a/Userland/Libraries/LibWeb/HTML/Timer.h
+++ b/Userland/Libraries/LibWeb/HTML/Timer.h
@@ -19,6 +19,7 @@ namespace Web::HTML {
 
 class Timer final : public JS::Cell {
     JS_CELL(Timer, JS::Cell);
+    JS_DECLARE_ALLOCATOR(Timer);
 
 public:
     static JS::NonnullGCPtr<Timer> create(JS::Object&, i32 milliseconds, Function<void()> callback, i32 id);
diff --git a/Userland/Libraries/LibWeb/HTML/ToggleEvent.cpp b/Userland/Libraries/LibWeb/HTML/ToggleEvent.cpp
index 79662d8924..55e52b831b 100644
--- a/Userland/Libraries/LibWeb/HTML/ToggleEvent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/ToggleEvent.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(ToggleEvent);
+
 JS::NonnullGCPtr<ToggleEvent> ToggleEvent::create(JS::Realm& realm, FlyString const& event_name, ToggleEventInit event_init)
 {
     return realm.heap().allocate<ToggleEvent>(realm, realm, event_name, move(event_init));
diff --git a/Userland/Libraries/LibWeb/HTML/ToggleEvent.h b/Userland/Libraries/LibWeb/HTML/ToggleEvent.h
index 45061991f6..f70882e6a9 100644
--- a/Userland/Libraries/LibWeb/HTML/ToggleEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/ToggleEvent.h
@@ -19,6 +19,7 @@ struct ToggleEventInit : public DOM::EventInit {
 
 class ToggleEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(ToggleEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(ToggleEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ToggleEvent> create(JS::Realm&, FlyString const& event_name, ToggleEventInit = {});
diff --git a/Userland/Libraries/LibWeb/HTML/TrackEvent.h b/Userland/Libraries/LibWeb/HTML/TrackEvent.h
index 5e03d7456c..8b2b05d31a 100644
--- a/Userland/Libraries/LibWeb/HTML/TrackEvent.h
+++ b/Userland/Libraries/LibWeb/HTML/TrackEvent.h
@@ -21,6 +21,7 @@ struct TrackEventInit : public DOM::EventInit {
 
 class TrackEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(TrackEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(TrackEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<TrackEvent> create(JS::Realm&, FlyString const& event_name, TrackEventInit = {});
diff --git a/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp b/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp
index cfdec1ed13..dc1624602c 100644
--- a/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp
+++ b/Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(TraversableNavigable);
+
 TraversableNavigable::TraversableNavigable(Page& page)
     : m_page(page)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/TraversableNavigable.h b/Userland/Libraries/LibWeb/HTML/TraversableNavigable.h
index f835192448..4915930cc9 100644
--- a/Userland/Libraries/LibWeb/HTML/TraversableNavigable.h
+++ b/Userland/Libraries/LibWeb/HTML/TraversableNavigable.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/document-sequences.html#traversable-navigable
 class TraversableNavigable final : public Navigable {
     JS_CELL(TraversableNavigable, Navigable);
+    JS_DECLARE_ALLOCATOR(TraversableNavigable);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<TraversableNavigable>> create_a_new_top_level_traversable(Page&, JS::GCPtr<BrowsingContext> opener, String target_name);
diff --git a/Userland/Libraries/LibWeb/HTML/VideoTrack.cpp b/Userland/Libraries/LibWeb/HTML/VideoTrack.cpp
index 4e5f3bf05f..6ba37eafac 100644
--- a/Userland/Libraries/LibWeb/HTML/VideoTrack.cpp
+++ b/Userland/Libraries/LibWeb/HTML/VideoTrack.cpp
@@ -22,6 +22,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(VideoTrack);
+
 static IDAllocator s_video_track_id_allocator;
 
 VideoTrack::VideoTrack(JS::Realm& realm, JS::NonnullGCPtr<HTMLMediaElement> media_element, NonnullOwnPtr<Video::PlaybackManager> playback_manager)
diff --git a/Userland/Libraries/LibWeb/HTML/VideoTrack.h b/Userland/Libraries/LibWeb/HTML/VideoTrack.h
index 558010907d..ad6f48ab26 100644
--- a/Userland/Libraries/LibWeb/HTML/VideoTrack.h
+++ b/Userland/Libraries/LibWeb/HTML/VideoTrack.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 
 class VideoTrack final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(VideoTrack, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(VideoTrack);
 
 public:
     virtual ~VideoTrack() override;
diff --git a/Userland/Libraries/LibWeb/HTML/VideoTrackList.cpp b/Userland/Libraries/LibWeb/HTML/VideoTrackList.cpp
index c75b0f6730..8f0deb290d 100644
--- a/Userland/Libraries/LibWeb/HTML/VideoTrackList.cpp
+++ b/Userland/Libraries/LibWeb/HTML/VideoTrackList.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(VideoTrackList);
+
 VideoTrackList::VideoTrackList(JS::Realm& realm)
     : DOM::EventTarget(realm, MayInterfereWithIndexedPropertyAccess::Yes)
     , m_video_tracks(realm.heap())
diff --git a/Userland/Libraries/LibWeb/HTML/VideoTrackList.h b/Userland/Libraries/LibWeb/HTML/VideoTrackList.h
index f0d12ce755..6839101c8a 100644
--- a/Userland/Libraries/LibWeb/HTML/VideoTrackList.h
+++ b/Userland/Libraries/LibWeb/HTML/VideoTrackList.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 
 class VideoTrackList final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(VideoTrackList, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(VideoTrackList);
 
 public:
     ErrorOr<void> add_track(Badge<HTMLMediaElement>, JS::NonnullGCPtr<VideoTrack>);
diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index 5130080fc8..e6fad1337b 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -70,6 +70,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Window);
+
 // https://html.spec.whatwg.org/#run-the-animation-frame-callbacks
 void run_animation_frame_callbacks(DOM::Document& document, double)
 {
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index 1305165f37..c386af80f4 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -50,6 +50,7 @@ class Window final
     , public WindowOrWorkerGlobalScopeMixin
     , public Bindings::WindowGlobalMixin {
     WEB_PLATFORM_OBJECT(Window, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(Window);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Window> create(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp b/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
index 0cd438bea1..7dfd310ff8 100644
--- a/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WindowProxy.cpp
@@ -20,6 +20,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WindowProxy);
+
 // 7.4 The WindowProxy exotic object, https://html.spec.whatwg.org/multipage/window-object.html#the-windowproxy-exotic-object
 WindowProxy::WindowProxy(JS::Realm& realm)
     : JS::Object(realm, nullptr, MayInterfereWithIndexedPropertyAccess::Yes)
diff --git a/Userland/Libraries/LibWeb/HTML/WindowProxy.h b/Userland/Libraries/LibWeb/HTML/WindowProxy.h
index 7865a17a3c..c4276e9a67 100644
--- a/Userland/Libraries/LibWeb/HTML/WindowProxy.h
+++ b/Userland/Libraries/LibWeb/HTML/WindowProxy.h
@@ -16,6 +16,7 @@ namespace Web::HTML {
 
 class WindowProxy final : public JS::Object {
     JS_OBJECT(WindowProxy, JS::Object);
+    JS_DECLARE_ALLOCATOR(WindowProxy);
 
 public:
     virtual ~WindowProxy() override = default;
diff --git a/Userland/Libraries/LibWeb/HTML/Worker.cpp b/Userland/Libraries/LibWeb/HTML/Worker.cpp
index 31b922b4ea..ab9a4dd32d 100644
--- a/Userland/Libraries/LibWeb/HTML/Worker.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Worker.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(Worker);
+
 // https://html.spec.whatwg.org/multipage/workers.html#dedicated-workers-and-the-worker-interface
 Worker::Worker(String const& script_url, WorkerOptions const options, DOM::Document& document)
     : DOM::EventTarget(document.realm())
diff --git a/Userland/Libraries/LibWeb/HTML/Worker.h b/Userland/Libraries/LibWeb/HTML/Worker.h
index e9638d9209..2ccc4c4704 100644
--- a/Userland/Libraries/LibWeb/HTML/Worker.h
+++ b/Userland/Libraries/LibWeb/HTML/Worker.h
@@ -29,6 +29,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/workers.html#dedicated-workers-and-the-worker-interface
 class Worker : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(Worker, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(Worker);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Worker>> create(String const& script_url, WorkerOptions const options, DOM::Document& document);
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp b/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
index 20da5d4f80..1a0dbc298e 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WorkerAgent.cpp
@@ -93,6 +93,8 @@ ErrorOr<NonnullRefPtr<Web::HTML::WebWorkerClient>> launch_web_worker_process(Rea
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WorkerAgent);
+
 WorkerAgent::WorkerAgent(AK::URL url, WorkerOptions const& options)
     : m_worker_options(options)
     , m_url(move(url))
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerAgent.h b/Userland/Libraries/LibWeb/HTML/WorkerAgent.h
index 57a1baa56f..afd6f1f026 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerAgent.h
+++ b/Userland/Libraries/LibWeb/HTML/WorkerAgent.h
@@ -25,6 +25,7 @@ struct WorkerOptions {
 
 struct WorkerAgent : JS::Cell {
     JS_CELL(Agent, JS::Cell);
+    JS_DECLARE_ALLOCATOR(WorkerAgent);
 
     WorkerAgent(AK::URL url, WorkerOptions const& options);
 
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp b/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
index fb2704632a..5ccc09d508 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WorkerGlobalScope);
+
 WorkerGlobalScope::WorkerGlobalScope(JS::Realm& realm, Web::Page& page)
     : DOM::EventTarget(realm)
     , m_page(page)
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.h b/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.h
index b665e44ffd..acdb88c940 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.h
+++ b/Userland/Libraries/LibWeb/HTML/WorkerGlobalScope.h
@@ -33,6 +33,7 @@ class WorkerGlobalScope
     : public DOM::EventTarget
     , public WindowOrWorkerGlobalScopeMixin {
     WEB_PLATFORM_OBJECT(WorkerGlobalScope, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(WorkerGlobalScope);
 
 public:
     virtual ~WorkerGlobalScope() override;
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerLocation.cpp b/Userland/Libraries/LibWeb/HTML/WorkerLocation.cpp
index c80ee7bddb..d2a8fd4a88 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerLocation.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WorkerLocation.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WorkerLocation);
+
 // https://html.spec.whatwg.org/multipage/workers.html#dom-workerlocation-href
 WebIDL::ExceptionOr<String> WorkerLocation::href() const
 {
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerLocation.h b/Userland/Libraries/LibWeb/HTML/WorkerLocation.h
index 748a044fa0..372f1ba7d9 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerLocation.h
+++ b/Userland/Libraries/LibWeb/HTML/WorkerLocation.h
@@ -13,6 +13,7 @@ namespace Web::HTML {
 // https://html.spec.whatwg.org/multipage/workers.html#worker-locations
 class WorkerLocation : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(WorkerLocation, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(WorkerLocation);
 
 public:
     virtual ~WorkerLocation() override;
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerNavigator.cpp b/Userland/Libraries/LibWeb/HTML/WorkerNavigator.cpp
index 2585f260b4..5473c9c8e5 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerNavigator.cpp
+++ b/Userland/Libraries/LibWeb/HTML/WorkerNavigator.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::HTML {
 
+JS_DEFINE_ALLOCATOR(WorkerNavigator);
+
 JS::NonnullGCPtr<WorkerNavigator> WorkerNavigator::create(WorkerGlobalScope& global_scope)
 {
     return global_scope.heap().allocate<WorkerNavigator>(global_scope.realm(), global_scope);
diff --git a/Userland/Libraries/LibWeb/HTML/WorkerNavigator.h b/Userland/Libraries/LibWeb/HTML/WorkerNavigator.h
index d5e73cb22e..3ca0c1fb58 100644
--- a/Userland/Libraries/LibWeb/HTML/WorkerNavigator.h
+++ b/Userland/Libraries/LibWeb/HTML/WorkerNavigator.h
@@ -20,6 +20,7 @@ class WorkerNavigator : public Bindings::PlatformObject
     , public NavigatorLanguageMixin
     , public NavigatorOnLineMixin {
     WEB_PLATFORM_OBJECT(WorkerNavigator, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(WorkerNavigator);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<WorkerNavigator> create(WorkerGlobalScope&);
diff --git a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp
index da20ff69e7..e346436bf9 100644
--- a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp
+++ b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::HighResolutionTime {
 
+JS_DEFINE_ALLOCATOR(Performance);
+
 Performance::Performance(HTML::Window& window)
     : DOM::EventTarget(window.realm())
     , m_window(window)
diff --git a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h
index a8d6881cda..cdda943ae8 100644
--- a/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h
+++ b/Userland/Libraries/LibWeb/HighResolutionTime/Performance.h
@@ -16,6 +16,7 @@ namespace Web::HighResolutionTime {
 
 class Performance final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(Performance, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(Performance);
 
 public:
     virtual ~Performance() override;
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.cpp b/Userland/Libraries/LibWeb/Internals/Internals.cpp
index 28bf0cc0da..e25e17b1b6 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.cpp
+++ b/Userland/Libraries/LibWeb/Internals/Internals.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::Internals {
 
+JS_DEFINE_ALLOCATOR(Internals);
+
 Internals::Internals(JS::Realm& realm)
     : Bindings::PlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/Internals/Internals.h b/Userland/Libraries/LibWeb/Internals/Internals.h
index 00f88fe724..b5c1a7fa62 100644
--- a/Userland/Libraries/LibWeb/Internals/Internals.h
+++ b/Userland/Libraries/LibWeb/Internals/Internals.h
@@ -12,6 +12,7 @@ namespace Web::Internals {
 
 class Internals final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Internals, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Internals);
 
 public:
     virtual ~Internals() override;
diff --git a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
index 65f29cee98..f9a9c7361c 100644
--- a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
+++ b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::IntersectionObserver {
 
+JS_DEFINE_ALLOCATOR(IntersectionObserver);
+
 // https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-intersectionobserver
 WebIDL::ExceptionOr<JS::NonnullGCPtr<IntersectionObserver>> IntersectionObserver::construct_impl(JS::Realm& realm, JS::GCPtr<WebIDL::CallbackType> callback, IntersectionObserverInit const& options)
 {
diff --git a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.h b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.h
index 9debb0ff7a..83fbee91c0 100644
--- a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.h
+++ b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserver.h
@@ -38,6 +38,7 @@ struct IntersectionObserverRegistration {
 // https://w3c.github.io/IntersectionObserver/#intersection-observer-interface
 class IntersectionObserver final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(IntersectionObserver, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(IntersectionObserver);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<IntersectionObserver>> construct_impl(JS::Realm&, JS::GCPtr<WebIDL::CallbackType> callback, IntersectionObserverInit const& options = {});
diff --git a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.cpp b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.cpp
index e24bdd6ac0..c6fd75503b 100644
--- a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.cpp
+++ b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::IntersectionObserver {
 
+JS_DEFINE_ALLOCATOR(IntersectionObserverEntry);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<IntersectionObserverEntry>> IntersectionObserverEntry::construct_impl(JS::Realm& realm, Web::IntersectionObserver::IntersectionObserverEntryInit const& options)
 {
     auto& vm = realm.vm();
diff --git a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.h b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.h
index 8726677ee5..fb66952f1b 100644
--- a/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.h
+++ b/Userland/Libraries/LibWeb/IntersectionObserver/IntersectionObserverEntry.h
@@ -37,6 +37,7 @@ struct IntersectionObserverEntryInit {
 
 class IntersectionObserverEntry final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(IntersectionObserverEntry, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(IntersectionObserverEntry);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<IntersectionObserverEntry>> construct_impl(JS::Realm&, IntersectionObserverEntryInit const& options);
diff --git a/Userland/Libraries/LibWeb/MathML/MathMLElement.cpp b/Userland/Libraries/LibWeb/MathML/MathMLElement.cpp
index 5fe84814e4..6c4a761f3b 100644
--- a/Userland/Libraries/LibWeb/MathML/MathMLElement.cpp
+++ b/Userland/Libraries/LibWeb/MathML/MathMLElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::MathML {
 
+JS_DEFINE_ALLOCATOR(MathMLElement);
+
 MathMLElement::~MathMLElement() = default;
 
 MathMLElement::MathMLElement(DOM::Document& document, DOM::QualifiedName qualified_name)
diff --git a/Userland/Libraries/LibWeb/MathML/MathMLElement.h b/Userland/Libraries/LibWeb/MathML/MathMLElement.h
index ec4682f288..613bce5d46 100644
--- a/Userland/Libraries/LibWeb/MathML/MathMLElement.h
+++ b/Userland/Libraries/LibWeb/MathML/MathMLElement.h
@@ -15,6 +15,7 @@ namespace Web::MathML {
 class MathMLElement : public DOM::Element
     , public HTML::GlobalEventHandlers {
     WEB_PLATFORM_OBJECT(MathMLElement, Element);
+    JS_DECLARE_ALLOCATOR(MathMLElement);
 
 public:
     virtual ~MathMLElement() override;
diff --git a/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.cpp b/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.cpp
index f52c2effc5..605ab97bc7 100644
--- a/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.cpp
+++ b/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.cpp
@@ -8,6 +8,8 @@
 
 namespace Web::NavigationTiming {
 
+JS_DEFINE_ALLOCATOR(PerformanceTiming);
+
 PerformanceTiming::PerformanceTiming(HTML::Window& window)
     : PlatformObject(window.realm())
     , m_window(window)
diff --git a/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.h b/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.h
index fa711fb634..0c9798d9e0 100644
--- a/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.h
+++ b/Userland/Libraries/LibWeb/NavigationTiming/PerformanceTiming.h
@@ -12,6 +12,7 @@ namespace Web::NavigationTiming {
 
 class PerformanceTiming final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(PerformanceTiming, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(PerformanceTiming);
 
 public:
     using AllowOwnPtr = TrueType;
diff --git a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.cpp b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.cpp
index ae30169a9c..a7883419c3 100644
--- a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.cpp
+++ b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::PerformanceTimeline {
 
+JS_DEFINE_ALLOCATOR(PerformanceObserver);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<PerformanceObserver>> PerformanceObserver::construct_impl(JS::Realm& realm, JS::GCPtr<WebIDL::CallbackType> callback)
 {
     return realm.heap().allocate<PerformanceObserver>(realm, realm, callback);
diff --git a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.h b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.h
index c1a0a66b76..d6da82ed13 100644
--- a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.h
+++ b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserver.h
@@ -21,6 +21,7 @@ struct PerformanceObserverInit {
 // https://w3c.github.io/performance-timeline/#dom-performanceobserver
 class PerformanceObserver final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(PerformanceObserver, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(PerformanceObserver);
 
 public:
     enum class ObserverType {
diff --git a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.cpp b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.cpp
index a78e661356..4cb3d5d277 100644
--- a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.cpp
+++ b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::PerformanceTimeline {
 
+JS_DEFINE_ALLOCATOR(PerformanceObserverEntryList);
+
 PerformanceObserverEntryList::PerformanceObserverEntryList(JS::Realm& realm, Vector<JS::NonnullGCPtr<PerformanceTimeline::PerformanceEntry>>&& entry_list)
     : Bindings::PlatformObject(realm)
     , m_entry_list(move(entry_list))
diff --git a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.h b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.h
index 04a9194a6a..8aa66939ad 100644
--- a/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.h
+++ b/Userland/Libraries/LibWeb/PerformanceTimeline/PerformanceObserverEntryList.h
@@ -13,6 +13,7 @@ namespace Web::PerformanceTimeline {
 // https://w3c.github.io/performance-timeline/#performanceobserverentrylist-interface
 class PerformanceObserverEntryList final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(PerformanceObserverEntryList, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(PerformanceObserverEntryList);
 
 public:
     virtual ~PerformanceObserverEntryList() override;
diff --git a/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.cpp b/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.cpp
index b0d6fb123d..d7c5cbb0c5 100644
--- a/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.cpp
+++ b/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::RequestIdleCallback {
 
+JS_DEFINE_ALLOCATOR(IdleDeadline);
+
 JS::NonnullGCPtr<IdleDeadline> IdleDeadline::create(JS::Realm& realm, bool did_timeout)
 {
     return realm.heap().allocate<IdleDeadline>(realm, realm, did_timeout);
diff --git a/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.h b/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.h
index 3776599c6d..9d54f9ed7b 100644
--- a/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.h
+++ b/Userland/Libraries/LibWeb/RequestIdleCallback/IdleDeadline.h
@@ -13,6 +13,7 @@ namespace Web::RequestIdleCallback {
 
 class IdleDeadline final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(IdleDeadline, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(IdleDeadline);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<IdleDeadline> create(JS::Realm&, bool did_timeout = false);
diff --git a/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.cpp b/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.cpp
index 3c8473c0bf..8398e14750 100644
--- a/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.cpp
+++ b/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::ResizeObserver {
 
+JS_DEFINE_ALLOCATOR(ResizeObserver);
+
 // https://drafts.csswg.org/resize-observer/#dom-resizeobserver-resizeobserver
 WebIDL::ExceptionOr<JS::NonnullGCPtr<ResizeObserver>> ResizeObserver::construct_impl(JS::Realm& realm, WebIDL::CallbackType* callback)
 {
diff --git a/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.h b/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.h
index 021a8c297d..4a05669aea 100644
--- a/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.h
+++ b/Userland/Libraries/LibWeb/ResizeObserver/ResizeObserver.h
@@ -17,6 +17,7 @@ struct ResizeObserverOptions {
 // https://drafts.csswg.org/resize-observer/#resize-observer-interface
 class ResizeObserver : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ResizeObserver, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ResizeObserver);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<ResizeObserver>> construct_impl(JS::Realm&, WebIDL::CallbackType* callback);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp
index 2c1c8b12a1..730ac0af60 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGAnimatedLength);
+
 JS::NonnullGCPtr<SVGAnimatedLength> SVGAnimatedLength::create(JS::Realm& realm, JS::NonnullGCPtr<SVGLength> base_val, JS::NonnullGCPtr<SVGLength> anim_val)
 {
     return realm.heap().allocate<SVGAnimatedLength>(realm, realm, move(base_val), move(anim_val));
diff --git a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h
index 5aab8e6c1c..75f6f35895 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 // https://www.w3.org/TR/SVG11/types.html#InterfaceSVGAnimatedLength
 class SVGAnimatedLength final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(SVGAnimatedLength, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(SVGAnimatedLength);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<SVGAnimatedLength> create(JS::Realm&, JS::NonnullGCPtr<SVGLength> base_val, JS::NonnullGCPtr<SVGLength> anim_val);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.cpp b/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.cpp
index 6304096fba..2213809890 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGAnimatedNumber);
+
 JS::NonnullGCPtr<SVGAnimatedNumber> SVGAnimatedNumber::create(JS::Realm& realm, float base_val, float anim_val)
 {
     return realm.heap().allocate<SVGAnimatedNumber>(realm, realm, base_val, anim_val);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.h b/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.h
index b08aa94331..f3f84161f0 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGAnimatedNumber.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 // https://www.w3.org/TR/SVG11/types.html#InterfaceSVGAnimatedNumber
 class SVGAnimatedNumber final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(SVGAnimatedNumber, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(SVGAnimatedNumber);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<SVGAnimatedNumber> create(JS::Realm&, float base_val, float anim_val);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp
index 19ded4af40..30aa0d39d1 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGCircleElement);
+
 SVGCircleElement::SVGCircleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGeometryElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h
index 60a7952a31..06a334c160 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 
 class SVGCircleElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGCircleElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGCircleElement);
 
 public:
     virtual ~SVGCircleElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.cpp
index 4ded39d8c9..9813ed5123 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGClipPathElement);
+
 SVGClipPathElement::SVGClipPathElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.h b/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.h
index e5d562eba6..c748cbac63 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGClipPathElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGClipPathElement final : public SVGElement {
     WEB_PLATFORM_OBJECT(SVGClipPathElement, SVGElement);
+    JS_DECLARE_ALLOCATOR(SVGClipPathElement);
 
 public:
     virtual ~SVGClipPathElement();
diff --git a/Userland/Libraries/LibWeb/SVG/SVGDefsElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGDefsElement.cpp
index 119830da61..c1d026ca9a 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGDefsElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGDefsElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGDefsElement);
+
 SVGDefsElement::SVGDefsElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGraphicsElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGDefsElement.h b/Userland/Libraries/LibWeb/SVG/SVGDefsElement.h
index a875239cca..6d5e63169f 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGDefsElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGDefsElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGDefsElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGDefsElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGDefsElement);
 
 public:
     virtual ~SVGDefsElement();
diff --git a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp
index f13b0d0619..1b85b6eb64 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGEllipseElement);
+
 SVGEllipseElement::SVGEllipseElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGeometryElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h
index f86bcf98ab..1ec2c07cb2 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 
 class SVGEllipseElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGEllipseElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGEllipseElement);
 
 public:
     virtual ~SVGEllipseElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp
index c33d1f5434..09e83afd14 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGForeignObjectElement);
+
 SVGForeignObjectElement::SVGForeignObjectElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGraphicsElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.h b/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.h
index 4c7b2f12f0..94088ee79d 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGForeignObjectElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 // https://svgwg.org/svg2-draft/embedded.html#InterfaceSVGForeignObjectElement
 class SVGForeignObjectElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGForeignObjectElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGForeignObjectElement);
 
 public:
     virtual ~SVGForeignObjectElement() override;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGGElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGGElement.cpp
index 25fdd0beee..87755e7de5 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGGElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGGElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGGElement);
+
 SVGGElement::SVGGElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGraphicsElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGGElement.h b/Userland/Libraries/LibWeb/SVG/SVGGElement.h
index 825983c2dc..3431a9ebe7 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGGElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGGElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGGElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGGElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGGElement);
 
 public:
     virtual ~SVGGElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLength.cpp b/Userland/Libraries/LibWeb/SVG/SVGLength.cpp
index ae53ce61e0..499db9868e 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLength.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGLength.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGLength);
+
 JS::NonnullGCPtr<SVGLength> SVGLength::create(JS::Realm& realm, u8 unit_type, float value)
 {
     return realm.heap().allocate<SVGLength>(realm, realm, unit_type, value);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLength.h b/Userland/Libraries/LibWeb/SVG/SVGLength.h
index 832e19216e..b942654f4f 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLength.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGLength.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 // https://www.w3.org/TR/SVG11/types.html#InterfaceSVGLength
 class SVGLength : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(SVGLength, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(SVGLength);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<SVGLength> create(JS::Realm&, u8 unit_type, float value);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp
index 1c9ebaf7ef..227b9df6bd 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGLineElement);
+
 SVGLineElement::SVGLineElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGeometryElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLineElement.h b/Userland/Libraries/LibWeb/SVG/SVGLineElement.h
index 7962c99610..c7fa5b3de6 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLineElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGLineElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 
 class SVGLineElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGLineElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGLineElement);
 
 public:
     virtual ~SVGLineElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.cpp
index 319128ee5c..c9e2b35217 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGLinearGradientElement);
+
 SVGLinearGradientElement::SVGLinearGradientElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGradientElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.h b/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.h
index 144e5a03fb..88840c64b5 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 
 class SVGLinearGradientElement : public SVGGradientElement {
     WEB_PLATFORM_OBJECT(SVGLinearGradientElement, SVGGradientElement);
+    JS_DECLARE_ALLOCATOR(SVGLinearGradientElement);
 
 public:
     virtual ~SVGLinearGradientElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGMaskElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGMaskElement.cpp
index 5125a1c8ce..dd3277e2a7 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGMaskElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGMaskElement.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGMaskElement);
+
 SVGMaskElement::SVGMaskElement(DOM::Document& document, DOM::QualifiedName tag_name)
     : SVGGraphicsElement(document, move(tag_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGMaskElement.h b/Userland/Libraries/LibWeb/SVG/SVGMaskElement.h
index cf81a7ae13..367258039a 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGMaskElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGMaskElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 
 class SVGMaskElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGMaskElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGMaskElement);
 
 public:
     virtual ~SVGMaskElement() override;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGPathElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGPathElement.cpp
index f8c77da146..76965ef90c 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGPathElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGPathElement.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGPathElement);
+
 [[maybe_unused]] static void print_instruction(PathInstruction const& instruction)
 {
     VERIFY(PATH_DEBUG);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGPathElement.h b/Userland/Libraries/LibWeb/SVG/SVGPathElement.h
index 56dc6ba6e6..00e90fd1ec 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGPathElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGPathElement.h
@@ -15,6 +15,7 @@ namespace Web::SVG {
 
 class SVGPathElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGPathElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGPathElement);
 
 public:
     virtual ~SVGPathElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.cpp
index e56d376fd4..6a9b799ce0 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGPolygonElement);
+
 SVGPolygonElement::SVGPolygonElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGeometryElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.h b/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.h
index a48a5603b7..cae0eebaea 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGPolygonElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGPolygonElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGPolygonElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGPolygonElement);
 
 public:
     virtual ~SVGPolygonElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.cpp
index 9fb7e67961..17669f0699 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGPolylineElement);
+
 SVGPolylineElement::SVGPolylineElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGeometryElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.h b/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.h
index 76c1db57c6..c8ce7735c3 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGPolylineElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGPolylineElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGPolylineElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGPolylineElement);
 
 public:
     virtual ~SVGPolylineElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.cpp
index ff032ca612..ac42c4b031 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGRadialGradientElement);
+
 SVGRadialGradientElement::SVGRadialGradientElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGradientElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.h b/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.h
index 0d86adb8c5..31222582ae 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGRadialGradientElement.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 
 class SVGRadialGradientElement : public SVGGradientElement {
     WEB_PLATFORM_OBJECT(SVGRadialGradientElement, SVGGradientElement);
+    JS_DECLARE_ALLOCATOR(SVGRadialGradientElement);
 
 public:
     virtual ~SVGRadialGradientElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp
index 11db73d2f2..a18f9509a5 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGRectElement);
+
 SVGRectElement::SVGRectElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGeometryElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGRectElement.h b/Userland/Libraries/LibWeb/SVG/SVGRectElement.h
index c8dc7f30e7..05caf1c374 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGRectElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGRectElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 // https://www.w3.org/TR/SVG11/shapes.html#RectElement
 class SVGRectElement final : public SVGGeometryElement {
     WEB_PLATFORM_OBJECT(SVGRectElement, SVGGeometryElement);
+    JS_DECLARE_ALLOCATOR(SVGRectElement);
 
 public:
     virtual ~SVGRectElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGSVGElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGSVGElement.cpp
index 1b7f4d2e57..c8f3afc885 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGSVGElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGSVGElement.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGSVGElement);
+
 SVGSVGElement::SVGSVGElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGraphicsElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGSVGElement.h b/Userland/Libraries/LibWeb/SVG/SVGSVGElement.h
index 4d3f643982..084ad02622 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGSVGElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGSVGElement.h
@@ -15,6 +15,7 @@ namespace Web::SVG {
 
 class SVGSVGElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGSVGElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGSVGElement);
 
 public:
     virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGScriptElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGScriptElement.cpp
index 5f73f94c4c..e063caa5d3 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGScriptElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGScriptElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGScriptElement);
+
 SVGScriptElement::SVGScriptElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGScriptElement.h b/Userland/Libraries/LibWeb/SVG/SVGScriptElement.h
index 7c841c269f..e59dd4b9cf 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGScriptElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGScriptElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 // https://www.w3.org/TR/SVG/interact.html#InterfaceSVGScriptElement
 class SVGScriptElement : public SVGElement {
     WEB_PLATFORM_OBJECT(SVGScriptElement, SVGElement);
+    JS_DECLARE_ALLOCATOR(SVGScriptElement);
 
 public:
     void process_the_script_element();
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStopElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGStopElement.cpp
index 7efc8d6645..4e27d3c84d 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGStopElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGStopElement.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGStopElement);
+
 SVGStopElement::SVGStopElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStopElement.h b/Userland/Libraries/LibWeb/SVG/SVGStopElement.h
index 219c572b61..be36634e24 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGStopElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGStopElement.h
@@ -15,6 +15,7 @@ namespace Web::SVG {
 
 class SVGStopElement final : public SVGElement {
     WEB_PLATFORM_OBJECT(SVGStopElement, SVGElement);
+    JS_DECLARE_ALLOCATOR(SVGStopElement);
 
 public:
     virtual ~SVGStopElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp
index 8917a55456..df2880305d 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.cpp
@@ -8,6 +8,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGStyleElement);
+
 SVGStyleElement::SVGStyleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h
index e8b2a5ed70..bc1ae41cd4 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGStyleElement.h
@@ -13,6 +13,7 @@ namespace Web::SVG {
 
 class SVGStyleElement final : public SVGElement {
     WEB_PLATFORM_OBJECT(HTMLStyleElement, SVGElement);
+    JS_DECLARE_ALLOCATOR(SVGStyleElement);
 
 public:
     virtual ~SVGStyleElement() override;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.cpp
index 2cf3c88918..f9ae07f692 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.cpp
@@ -17,6 +17,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGSymbolElement);
+
 SVGSymbolElement::SVGSymbolElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGraphicsElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.h b/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.h
index 51ffdda933..f42b2a00be 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGSymbolElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGSymbolElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGSymbolElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGSymbolElement);
 
 public:
     virtual ~SVGSymbolElement() override = default;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.cpp
index 4cb89ad5e4..ed264dbdba 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGTSpanElement);
+
 SVGTSpanElement::SVGTSpanElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGTextPositioningElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.h b/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.h
index ef840ef812..114e523226 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGTSpanElement.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 // https://svgwg.org/svg2-draft/text.html#InterfaceSVGTSpanElement
 class SVGTSpanElement : public SVGTextPositioningElement {
     WEB_PLATFORM_OBJECT(SVGTSpanElement, SVGTextPositioningElement);
+    JS_DECLARE_ALLOCATOR(SVGTSpanElement);
 
 public:
     virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTextElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGTextElement.cpp
index 114ac28e06..f555a2fd29 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTextElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGTextElement.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGTextElement);
+
 SVGTextElement::SVGTextElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGTextPositioningElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTextElement.h b/Userland/Libraries/LibWeb/SVG/SVGTextElement.h
index 4d6adaa6dc..5e6f924297 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTextElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGTextElement.h
@@ -14,6 +14,7 @@ namespace Web::SVG {
 // https://svgwg.org/svg2-draft/text.html#InterfaceSVGTextElement
 class SVGTextElement : public SVGTextPositioningElement {
     WEB_PLATFORM_OBJECT(SVGTextElement, SVGTextPositioningElement);
+    JS_DECLARE_ALLOCATOR(SVGTextElement);
 
 public:
     virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTitleElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGTitleElement.cpp
index 2f04625243..79d4df0447 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTitleElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGTitleElement.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGTitleElement);
+
 SVGTitleElement::SVGTitleElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGElement(document, move(qualified_name))
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGTitleElement.h b/Userland/Libraries/LibWeb/SVG/SVGTitleElement.h
index ee468d9326..09ee74776e 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGTitleElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGTitleElement.h
@@ -12,6 +12,7 @@ namespace Web::SVG {
 
 class SVGTitleElement final : public SVGElement {
     WEB_PLATFORM_OBJECT(SVGTitleElement, SVGElement);
+    JS_DECLARE_ALLOCATOR(SVGTitleElement);
 
 private:
     SVGTitleElement(DOM::Document&, DOM::QualifiedName);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGUseElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGUseElement.cpp
index 84440d79b7..26c3e52fe3 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGUseElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGUseElement.cpp
@@ -17,6 +17,8 @@
 
 namespace Web::SVG {
 
+JS_DEFINE_ALLOCATOR(SVGUseElement);
+
 SVGUseElement::SVGUseElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : SVGGraphicsElement(document, qualified_name)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGUseElement.h b/Userland/Libraries/LibWeb/SVG/SVGUseElement.h
index edbae451d3..0e59e25853 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGUseElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGUseElement.h
@@ -16,6 +16,7 @@ namespace Web::SVG {
 
 class SVGUseElement final : public SVGGraphicsElement {
     WEB_PLATFORM_OBJECT(SVGUseElement, SVGGraphicsElement);
+    JS_DECLARE_ALLOCATOR(SVGUseElement);
 
 public:
     virtual ~SVGUseElement() override = default;
diff --git a/Userland/Libraries/LibWeb/Selection/Selection.cpp b/Userland/Libraries/LibWeb/Selection/Selection.cpp
index 7f6166df0d..6a1f6dd61d 100644
--- a/Userland/Libraries/LibWeb/Selection/Selection.cpp
+++ b/Userland/Libraries/LibWeb/Selection/Selection.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::Selection {
 
+JS_DEFINE_ALLOCATOR(Selection);
+
 JS::NonnullGCPtr<Selection> Selection::create(JS::NonnullGCPtr<JS::Realm> realm, JS::NonnullGCPtr<DOM::Document> document)
 {
     return realm->heap().allocate<Selection>(realm, realm, document);
diff --git a/Userland/Libraries/LibWeb/Selection/Selection.h b/Userland/Libraries/LibWeb/Selection/Selection.h
index f3df07e9a8..e2ba340a1d 100644
--- a/Userland/Libraries/LibWeb/Selection/Selection.h
+++ b/Userland/Libraries/LibWeb/Selection/Selection.h
@@ -13,6 +13,7 @@ namespace Web::Selection {
 
 class Selection final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Selection, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Selection);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<Selection> create(JS::NonnullGCPtr<JS::Realm>, JS::NonnullGCPtr<DOM::Document>);
diff --git a/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.cpp b/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.cpp
index afbfadf65d..641a7efa09 100644
--- a/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ByteLengthQueuingStrategy);
+
 // https://streams.spec.whatwg.org/#blqs-constructor
 WebIDL::ExceptionOr<JS::NonnullGCPtr<ByteLengthQueuingStrategy>> ByteLengthQueuingStrategy::construct_impl(JS::Realm& realm, QueuingStrategyInit const& init)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.h b/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.h
index de77eda1ee..56fd421066 100644
--- a/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.h
+++ b/Userland/Libraries/LibWeb/Streams/ByteLengthQueuingStrategy.h
@@ -17,6 +17,7 @@ namespace Web::Streams {
 // https://streams.spec.whatwg.org/#bytelengthqueuingstrategy
 class ByteLengthQueuingStrategy final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ByteLengthQueuingStrategy, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ByteLengthQueuingStrategy);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<ByteLengthQueuingStrategy>> construct_impl(JS::Realm&, QueuingStrategyInit const&);
diff --git a/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.cpp b/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.cpp
index 8e0ccc4080..3b851ee22e 100644
--- a/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.cpp
+++ b/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(CountQueuingStrategy);
+
 // https://streams.spec.whatwg.org/#blqs-constructor
 WebIDL::ExceptionOr<JS::NonnullGCPtr<CountQueuingStrategy>> CountQueuingStrategy::construct_impl(JS::Realm& realm, QueuingStrategyInit const& init)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.h b/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.h
index 6f28d293a4..b2bd040813 100644
--- a/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.h
+++ b/Userland/Libraries/LibWeb/Streams/CountQueuingStrategy.h
@@ -17,6 +17,7 @@ namespace Web::Streams {
 // https://streams.spec.whatwg.org/#countqueuingstrategy
 class CountQueuingStrategy final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(CountQueuingStrategy, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(CountQueuingStrategy);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<CountQueuingStrategy>> construct_impl(JS::Realm&, QueuingStrategyInit const&);
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.cpp b/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.cpp
index a9498dd7d9..f8c73e0338 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ReadableByteStreamController);
+
 // https://streams.spec.whatwg.org/#rbs-controller-desired-size
 Optional<double> ReadableByteStreamController::desired_size() const
 {
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.h b/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.h
index 620f2bdadc..247ef5b333 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableByteStreamController.h
@@ -72,6 +72,7 @@ struct ReadableByteStreamQueueEntry {
 // https://streams.spec.whatwg.org/#readablebytestreamcontroller
 class ReadableByteStreamController : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ReadableByteStreamController, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ReadableByteStreamController);
 
 public:
     virtual ~ReadableByteStreamController() override = default;
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
index 41af767116..1d46bcacdb 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStream.cpp
@@ -18,6 +18,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ReadableStream);
+
 // https://streams.spec.whatwg.org/#rs-constructor
 WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStream>> ReadableStream::construct_impl(JS::Realm& realm, Optional<JS::Handle<JS::Object>> const& underlying_source_object, QueuingStrategy const& strategy)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStream.h b/Userland/Libraries/LibWeb/Streams/ReadableStream.h
index 347e73c4f6..b7deff5f86 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStream.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStream.h
@@ -29,6 +29,7 @@ struct ReadableStreamGetReaderOptions {
 // https://streams.spec.whatwg.org/#readablestream
 class ReadableStream final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ReadableStream, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ReadableStream);
 
 public:
     enum class State {
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.cpp
index 50d62771e2..5d1345a2ef 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ReadableStreamBYOBReader);
+
 ReadableStreamBYOBReader::ReadableStreamBYOBReader(JS::Realm& realm)
     : Bindings::PlatformObject(realm)
     , ReadableStreamGenericReaderMixin(realm)
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.h b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.h
index 065e841e9e..2a7ba2cf27 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBReader.h
@@ -38,6 +38,7 @@ class ReadableStreamBYOBReader final
     : public Bindings::PlatformObject
     , public ReadableStreamGenericReaderMixin {
     WEB_PLATFORM_OBJECT(ReadableStreamBYOBReader, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ReadableStreamBYOBReader);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStreamBYOBReader>> construct_impl(JS::Realm&, JS::NonnullGCPtr<ReadableStream>);
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.cpp
index 1ab501dd00..97a926d5cc 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ReadableStreamBYOBRequest);
+
 // https://streams.spec.whatwg.org/#rs-byob-request-view
 JS::GCPtr<JS::TypedArrayBase> ReadableStreamBYOBRequest::view()
 {
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.h b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.h
index 594cf66efe..ab73147f43 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamBYOBRequest.h
@@ -16,6 +16,7 @@ namespace Web::Streams {
 // https://streams.spec.whatwg.org/#readablestreambyobrequest
 class ReadableStreamBYOBRequest : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ReadableStreamBYOBRequest, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ReadableStreamBYOBRequest);
 
 public:
     virtual ~ReadableStreamBYOBRequest() override = default;
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.cpp
index 036c84995c..b3f4424937 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ReadableStreamDefaultController);
+
 ReadableStreamDefaultController::ReadableStreamDefaultController(JS::Realm& realm)
     : Bindings::PlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.h b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.h
index 43bbd3e8ee..322d471438 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultController.h
@@ -20,6 +20,7 @@ namespace Web::Streams {
 // https://streams.spec.whatwg.org/#readablestreamdefaultcontroller
 class ReadableStreamDefaultController : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(ReadableStreamDefaultController, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ReadableStreamDefaultController);
 
 public:
     explicit ReadableStreamDefaultController(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.cpp b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.cpp
index 255e4d667c..162e7b4935 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.cpp
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.cpp
@@ -23,6 +23,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(ReadableStreamDefaultReader);
+
 void ReadLoopReadRequest::visit_edges(Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.h b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.h
index 4aa72986af..eb5e06594c 100644
--- a/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.h
+++ b/Userland/Libraries/LibWeb/Streams/ReadableStreamDefaultReader.h
@@ -65,6 +65,7 @@ class ReadableStreamDefaultReader final
     : public Bindings::PlatformObject
     , public ReadableStreamGenericReaderMixin {
     WEB_PLATFORM_OBJECT(ReadableStreamDefaultReader, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(ReadableStreamDefaultReader);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStreamDefaultReader>> construct_impl(JS::Realm&, JS::NonnullGCPtr<ReadableStream>);
diff --git a/Userland/Libraries/LibWeb/Streams/TransformStream.cpp b/Userland/Libraries/LibWeb/Streams/TransformStream.cpp
index c3319b99ee..63ca15df21 100644
--- a/Userland/Libraries/LibWeb/Streams/TransformStream.cpp
+++ b/Userland/Libraries/LibWeb/Streams/TransformStream.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(TransformStream);
+
 // https://streams.spec.whatwg.org/#ts-construct
 WebIDL::ExceptionOr<JS::NonnullGCPtr<TransformStream>> TransformStream::construct_impl(JS::Realm& realm, Optional<JS::Handle<JS::Object>> transformer_object, QueuingStrategy const& writable_strategy, QueuingStrategy const& readable_strategy)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/TransformStream.h b/Userland/Libraries/LibWeb/Streams/TransformStream.h
index 0a9bddcfdd..e41f15bded 100644
--- a/Userland/Libraries/LibWeb/Streams/TransformStream.h
+++ b/Userland/Libraries/LibWeb/Streams/TransformStream.h
@@ -16,6 +16,7 @@ namespace Web::Streams {
 
 class TransformStream final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TransformStream, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TransformStream);
 
 public:
     virtual ~TransformStream() override;
diff --git a/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.cpp b/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.cpp
index dd5b072acb..6351807c6a 100644
--- a/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.cpp
+++ b/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(TransformStreamDefaultController);
+
 TransformStreamDefaultController::TransformStreamDefaultController(JS::Realm& realm)
     : Bindings::PlatformObject(realm)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.h b/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.h
index 8ccf196bc1..df8ce807e0 100644
--- a/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.h
+++ b/Userland/Libraries/LibWeb/Streams/TransformStreamDefaultController.h
@@ -13,6 +13,7 @@ namespace Web::Streams {
 
 class TransformStreamDefaultController : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(TransformStreamDefaultController, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(TransformStreamDefaultController);
 
 public:
     explicit TransformStreamDefaultController(JS::Realm&);
diff --git a/Userland/Libraries/LibWeb/Streams/WritableStream.cpp b/Userland/Libraries/LibWeb/Streams/WritableStream.cpp
index 78d5c9cb42..ca5b6166ed 100644
--- a/Userland/Libraries/LibWeb/Streams/WritableStream.cpp
+++ b/Userland/Libraries/LibWeb/Streams/WritableStream.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(WritableStream);
+
 // https://streams.spec.whatwg.org/#ws-constructor
 WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStream>> WritableStream::construct_impl(JS::Realm& realm, Optional<JS::Handle<JS::Object>> const& underlying_sink_object, QueuingStrategy const& strategy)
 {
diff --git a/Userland/Libraries/LibWeb/Streams/WritableStream.h b/Userland/Libraries/LibWeb/Streams/WritableStream.h
index 84a1fdaba3..263c49bfe1 100644
--- a/Userland/Libraries/LibWeb/Streams/WritableStream.h
+++ b/Userland/Libraries/LibWeb/Streams/WritableStream.h
@@ -34,6 +34,7 @@ struct PendingAbortRequest {
 // https://streams.spec.whatwg.org/#writablestream
 class WritableStream final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(WritableStream, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(WritableStream);
 
 public:
     enum class State {
diff --git a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.cpp b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.cpp
index 4bb9463c99..6b8a6d2730 100644
--- a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.cpp
+++ b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(WritableStreamDefaultController);
+
 void WritableStreamDefaultController::visit_edges(Visitor& visitor)
 {
     Base::visit_edges(visitor);
diff --git a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.h b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.h
index 7b6c7fd858..15a9a80490 100644
--- a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.h
+++ b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultController.h
@@ -15,6 +15,7 @@ namespace Web::Streams {
 // https://streams.spec.whatwg.org/#writablestreamdefaultcontroller
 class WritableStreamDefaultController final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(WritableStreamDefaultController, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(WritableStreamDefaultController);
 
 public:
     virtual ~WritableStreamDefaultController() override = default;
diff --git a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.cpp b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.cpp
index 85aa7c9926..8836196047 100644
--- a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.cpp
+++ b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::Streams {
 
+JS_DEFINE_ALLOCATOR(WritableStreamDefaultWriter);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStreamDefaultWriter>> WritableStreamDefaultWriter::construct_impl(JS::Realm& realm, JS::NonnullGCPtr<WritableStream> stream)
 {
     auto writer = realm.heap().allocate<WritableStreamDefaultWriter>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.h b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.h
index 98d7dc7e3a..6f82fc5c77 100644
--- a/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.h
+++ b/Userland/Libraries/LibWeb/Streams/WritableStreamDefaultWriter.h
@@ -18,6 +18,7 @@ namespace Web::Streams {
 // https://streams.spec.whatwg.org/#writablestreamdefaultwriter
 class WritableStreamDefaultWriter final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(WritableStreamDefaultWriter, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(WritableStreamDefaultWriter);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<WritableStreamDefaultWriter>> construct_impl(JS::Realm&, JS::NonnullGCPtr<WritableStream>);
diff --git a/Userland/Libraries/LibWeb/UIEvents/FocusEvent.cpp b/Userland/Libraries/LibWeb/UIEvents/FocusEvent.cpp
index a666b99633..121d62f1e2 100644
--- a/Userland/Libraries/LibWeb/UIEvents/FocusEvent.cpp
+++ b/Userland/Libraries/LibWeb/UIEvents/FocusEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::UIEvents {
 
+JS_DEFINE_ALLOCATOR(FocusEvent);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<FocusEvent>> FocusEvent::construct_impl(JS::Realm& realm, FlyString const& event_name, FocusEventInit const& event_init)
 {
     return realm.heap().allocate<FocusEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/UIEvents/FocusEvent.h b/Userland/Libraries/LibWeb/UIEvents/FocusEvent.h
index 1494706096..e538752e35 100644
--- a/Userland/Libraries/LibWeb/UIEvents/FocusEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/FocusEvent.h
@@ -17,6 +17,7 @@ struct FocusEventInit : public UIEventInit {
 
 class FocusEvent final : public UIEvent {
     WEB_PLATFORM_OBJECT(FocusEvent, UIEvent);
+    JS_DECLARE_ALLOCATOR(FocusEvent);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<FocusEvent>> construct_impl(JS::Realm&, FlyString const& event_name, FocusEventInit const& event_init);
diff --git a/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.cpp b/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.cpp
index 7834a25e68..ee516f15de 100644
--- a/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.cpp
+++ b/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.cpp
@@ -11,6 +11,8 @@
 
 namespace Web::UIEvents {
 
+JS_DEFINE_ALLOCATOR(KeyboardEvent);
+
 // https://www.w3.org/TR/uievents/#determine-keydown-keyup-keyCode
 static unsigned long determine_key_code(KeyCode platform_key, u32 code_point)
 {
diff --git a/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h b/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h
index f7aa304e51..e8c40caede 100644
--- a/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/KeyboardEvent.h
@@ -34,6 +34,7 @@ enum class DOMKeyLocation {
 // https://www.w3.org/TR/uievents/#interface-keyboardevent
 class KeyboardEvent final : public UIEvent {
     WEB_PLATFORM_OBJECT(KeyboardEvent, UIEvent);
+    JS_DECLARE_ALLOCATOR(KeyboardEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<KeyboardEvent> create(JS::Realm&, FlyString const& event_name, KeyboardEventInit const& = {});
diff --git a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.cpp b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.cpp
index 03a7ecc6b7..7c781c8aba 100644
--- a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.cpp
+++ b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::UIEvents {
 
+JS_DEFINE_ALLOCATOR(MouseEvent);
+
 MouseEvent::MouseEvent(JS::Realm& realm, FlyString const& event_name, MouseEventInit const& event_init, double page_x, double page_y, double offset_x, double offset_y, unsigned modifiers)
     : UIEvent(realm, event_name, event_init)
     , m_screen_x(event_init.screen_x)
diff --git a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
index e1b41fe2d6..512b444941 100644
--- a/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/MouseEvent.h
@@ -26,6 +26,7 @@ struct MouseEventInit : public EventModifierInit {
 
 class MouseEvent : public UIEvent {
     WEB_PLATFORM_OBJECT(MouseEvent, UIEvent);
+    JS_DECLARE_ALLOCATOR(MouseEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<MouseEvent> create(JS::Realm&, FlyString const& event_name, MouseEventInit const& = {}, double page_x = 0, double page_y = 0, double offset_x = 0, double offset_y = 0, unsigned modifiers = 0);
diff --git a/Userland/Libraries/LibWeb/UIEvents/UIEvent.cpp b/Userland/Libraries/LibWeb/UIEvents/UIEvent.cpp
index afaf7b50c0..4f3b1c9bfa 100644
--- a/Userland/Libraries/LibWeb/UIEvents/UIEvent.cpp
+++ b/Userland/Libraries/LibWeb/UIEvents/UIEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::UIEvents {
 
+JS_DEFINE_ALLOCATOR(UIEvent);
+
 JS::NonnullGCPtr<UIEvent> UIEvent::create(JS::Realm& realm, FlyString const& event_name)
 {
     return realm.heap().allocate<UIEvent>(realm, realm, event_name);
diff --git a/Userland/Libraries/LibWeb/UIEvents/UIEvent.h b/Userland/Libraries/LibWeb/UIEvents/UIEvent.h
index 3879c1b0e4..44f3408805 100644
--- a/Userland/Libraries/LibWeb/UIEvents/UIEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/UIEvent.h
@@ -19,6 +19,7 @@ struct UIEventInit : public DOM::EventInit {
 
 class UIEvent : public DOM::Event {
     WEB_PLATFORM_OBJECT(UIEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(UIEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<UIEvent> create(JS::Realm&, FlyString const& type);
diff --git a/Userland/Libraries/LibWeb/UIEvents/WheelEvent.cpp b/Userland/Libraries/LibWeb/UIEvents/WheelEvent.cpp
index 2dfd88bdcc..2d665ccbc1 100644
--- a/Userland/Libraries/LibWeb/UIEvents/WheelEvent.cpp
+++ b/Userland/Libraries/LibWeb/UIEvents/WheelEvent.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::UIEvents {
 
+JS_DEFINE_ALLOCATOR(WheelEvent);
+
 WheelEvent::WheelEvent(JS::Realm& realm, FlyString const& event_name, WheelEventInit const& event_init, double page_x, double page_y, double offset_x, double offset_y, unsigned modifiers)
     : MouseEvent(realm, event_name, event_init, page_x, page_y, offset_x, offset_y, modifiers)
     , m_delta_x(event_init.delta_x)
diff --git a/Userland/Libraries/LibWeb/UIEvents/WheelEvent.h b/Userland/Libraries/LibWeb/UIEvents/WheelEvent.h
index 2982770cd1..a93f35501d 100644
--- a/Userland/Libraries/LibWeb/UIEvents/WheelEvent.h
+++ b/Userland/Libraries/LibWeb/UIEvents/WheelEvent.h
@@ -27,6 +27,7 @@ struct WheelEventInit : public MouseEventInit {
 
 class WheelEvent final : public MouseEvent {
     WEB_PLATFORM_OBJECT(WheelEvent, MouseEvent);
+    JS_DECLARE_ALLOCATOR(WheelEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<WheelEvent> create(JS::Realm&, FlyString const& event_name, WheelEventInit const& event_init = {}, double page_x = 0, double page_y = 0, double offset_x = 0, double offset_y = 0, unsigned modifiers = 0);
diff --git a/Userland/Libraries/LibWeb/URL/URL.cpp b/Userland/Libraries/LibWeb/URL/URL.cpp
index 5f0e8b1e0d..3db2e884f6 100644
--- a/Userland/Libraries/LibWeb/URL/URL.cpp
+++ b/Userland/Libraries/LibWeb/URL/URL.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::URL {
 
+JS_DEFINE_ALLOCATOR(URL);
+
 JS::NonnullGCPtr<URL> URL::create(JS::Realm& realm, AK::URL url, JS::NonnullGCPtr<URLSearchParams> query)
 {
     return realm.heap().allocate<URL>(realm, realm, move(url), move(query));
diff --git a/Userland/Libraries/LibWeb/URL/URL.h b/Userland/Libraries/LibWeb/URL/URL.h
index e3fd2f2e52..f8a70748d1 100644
--- a/Userland/Libraries/LibWeb/URL/URL.h
+++ b/Userland/Libraries/LibWeb/URL/URL.h
@@ -17,6 +17,7 @@ namespace Web::URL {
 
 class URL : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(URL, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(URL);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<URL> create(JS::Realm&, AK::URL, JS::NonnullGCPtr<URLSearchParams> query);
diff --git a/Userland/Libraries/LibWeb/URL/URLSearchParams.cpp b/Userland/Libraries/LibWeb/URL/URLSearchParams.cpp
index 97b2893918..0f1c6d392c 100644
--- a/Userland/Libraries/LibWeb/URL/URLSearchParams.cpp
+++ b/Userland/Libraries/LibWeb/URL/URLSearchParams.cpp
@@ -17,6 +17,8 @@
 
 namespace Web::URL {
 
+JS_DEFINE_ALLOCATOR(URLSearchParams);
+
 URLSearchParams::URLSearchParams(JS::Realm& realm, Vector<QueryParam> list)
     : PlatformObject(realm)
     , m_list(move(list))
diff --git a/Userland/Libraries/LibWeb/URL/URLSearchParams.h b/Userland/Libraries/LibWeb/URL/URLSearchParams.h
index f248e41380..f6acea5bae 100644
--- a/Userland/Libraries/LibWeb/URL/URLSearchParams.h
+++ b/Userland/Libraries/LibWeb/URL/URLSearchParams.h
@@ -21,6 +21,7 @@ ErrorOr<Vector<QueryParam>> url_decode(StringView);
 
 class URLSearchParams : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(URLSearchParams, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(URLSearchParams);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<URLSearchParams>> create(JS::Realm&, Vector<QueryParam> list);
diff --git a/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.cpp b/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.cpp
index ba058645c2..035ab95970 100644
--- a/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.cpp
+++ b/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.cpp
@@ -23,6 +23,8 @@ void Intrinsics::create_web_prototype_and_constructor<URLSearchParamsIteratorPro
 
 namespace Web::URL {
 
+JS_DEFINE_ALLOCATOR(URLSearchParamsIterator);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<URLSearchParamsIterator>> URLSearchParamsIterator::create(URLSearchParams const& url_search_params, JS::Object::PropertyKind iteration_kind)
 {
     return url_search_params.heap().allocate<URLSearchParamsIterator>(url_search_params.realm(), url_search_params, iteration_kind);
diff --git a/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.h b/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.h
index 7b2d81b2d4..cb41590eb0 100644
--- a/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.h
+++ b/Userland/Libraries/LibWeb/URL/URLSearchParamsIterator.h
@@ -13,6 +13,7 @@ namespace Web::URL {
 
 class URLSearchParamsIterator : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(URLSearchParamsIterator, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(URLSearchParamsIterator);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<URLSearchParamsIterator>> create(URLSearchParams const&, JS::Object::PropertyKind iteration_kind);
diff --git a/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.cpp b/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.cpp
index d2d6f268cc..efbdd1e264 100644
--- a/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.cpp
+++ b/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::UserTiming {
 
+JS_DEFINE_ALLOCATOR(PerformanceMark);
+
 PerformanceMark::PerformanceMark(JS::Realm& realm, String const& name, HighResolutionTime::DOMHighResTimeStamp start_time, HighResolutionTime::DOMHighResTimeStamp duration, JS::Value detail)
     : PerformanceTimeline::PerformanceEntry(realm, name, start_time, duration)
     , m_detail(detail)
diff --git a/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.h b/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.h
index 0013546ee0..f251d3e5ef 100644
--- a/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.h
+++ b/Userland/Libraries/LibWeb/UserTiming/PerformanceMark.h
@@ -19,6 +19,7 @@ struct PerformanceMarkOptions {
 // https://w3c.github.io/user-timing/#dom-performancemark
 class PerformanceMark final : public PerformanceTimeline::PerformanceEntry {
     WEB_PLATFORM_OBJECT(PerformanceMark, PerformanceTimeline::PerformanceEntry);
+    JS_DECLARE_ALLOCATOR(PerformanceMark);
 
 public:
     virtual ~PerformanceMark();
diff --git a/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.cpp b/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.cpp
index 0c88c27a24..710c9b370c 100644
--- a/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.cpp
+++ b/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.cpp
@@ -16,6 +16,8 @@
 
 namespace Web::UserTiming {
 
+JS_DEFINE_ALLOCATOR(PerformanceMeasure);
+
 PerformanceMeasure::PerformanceMeasure(JS::Realm& realm, String const& name, HighResolutionTime::DOMHighResTimeStamp start_time, HighResolutionTime::DOMHighResTimeStamp duration, JS::Value detail)
     : PerformanceTimeline::PerformanceEntry(realm, name, start_time, duration)
     , m_detail(detail)
diff --git a/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.h b/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.h
index a8cd45e3ad..cc423fdf5c 100644
--- a/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.h
+++ b/Userland/Libraries/LibWeb/UserTiming/PerformanceMeasure.h
@@ -21,6 +21,7 @@ struct PerformanceMeasureOptions {
 // https://w3c.github.io/user-timing/#dom-performancemeasure
 class PerformanceMeasure final : public PerformanceTimeline::PerformanceEntry {
     WEB_PLATFORM_OBJECT(PerformanceMeasure, PerformanceTimeline::PerformanceEntry);
+    JS_DECLARE_ALLOCATOR(PerformanceMeasure);
 
 public:
     virtual ~PerformanceMeasure();
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Instance.cpp b/Userland/Libraries/LibWeb/WebAssembly/Instance.cpp
index 9fb77abf59..2222582368 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Instance.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/Instance.cpp
@@ -20,6 +20,8 @@
 
 namespace Web::WebAssembly {
 
+JS_DEFINE_ALLOCATOR(Instance);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Instance>> Instance::construct_impl(JS::Realm& realm, Module& module, Optional<JS::Handle<JS::Object>>& import_object)
 {
     // FIXME: Implement the importObject parameter.
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Instance.h b/Userland/Libraries/LibWeb/WebAssembly/Instance.h
index 0c36f89ee6..c657a3e70e 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Instance.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/Instance.h
@@ -18,6 +18,7 @@ namespace Web::WebAssembly {
 
 class Instance : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Instance, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Instance);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Instance>> construct_impl(JS::Realm&, Module& module, Optional<JS::Handle<JS::Object>>& import_object);
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Memory.cpp b/Userland/Libraries/LibWeb/WebAssembly/Memory.cpp
index 864baf1c44..66b92b636e 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Memory.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/Memory.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::WebAssembly {
 
+JS_DEFINE_ALLOCATOR(Memory);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Memory>> Memory::construct_impl(JS::Realm& realm, MemoryDescriptor& descriptor)
 {
     auto& vm = realm.vm();
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Memory.h b/Userland/Libraries/LibWeb/WebAssembly/Memory.h
index 3176ad0d52..180bc29250 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Memory.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/Memory.h
@@ -24,6 +24,7 @@ struct MemoryDescriptor {
 
 class Memory : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Memory, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Memory);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Memory>> construct_impl(JS::Realm&, MemoryDescriptor& descriptor);
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Module.cpp b/Userland/Libraries/LibWeb/WebAssembly/Module.cpp
index c4d45dbcbe..e83d601ffe 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Module.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/Module.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::WebAssembly {
 
+JS_DEFINE_ALLOCATOR(Module);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<Module>> Module::construct_impl(JS::Realm& realm, JS::Handle<JS::Object>& bytes)
 {
     auto& vm = realm.vm();
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Module.h b/Userland/Libraries/LibWeb/WebAssembly/Module.h
index e5fb0bc56e..0433ec1405 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Module.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/Module.h
@@ -18,6 +18,7 @@ namespace Web::WebAssembly {
 
 class Module : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Module, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Module);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Module>> construct_impl(JS::Realm&, JS::Handle<JS::Object>& bytes);
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Table.cpp b/Userland/Libraries/LibWeb/WebAssembly/Table.cpp
index 0c192fe1c6..631041c437 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Table.cpp
+++ b/Userland/Libraries/LibWeb/WebAssembly/Table.cpp
@@ -14,6 +14,8 @@
 
 namespace Web::WebAssembly {
 
+JS_DEFINE_ALLOCATOR(Table);
+
 static Wasm::ValueType table_kind_to_value_type(Bindings::TableKind kind)
 {
     switch (kind) {
diff --git a/Userland/Libraries/LibWeb/WebAssembly/Table.h b/Userland/Libraries/LibWeb/WebAssembly/Table.h
index b70fb06509..98a7283558 100644
--- a/Userland/Libraries/LibWeb/WebAssembly/Table.h
+++ b/Userland/Libraries/LibWeb/WebAssembly/Table.h
@@ -26,6 +26,7 @@ struct TableDescriptor {
 
 class Table : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(Table, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(Table);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<Table>> construct_impl(JS::Realm&, TableDescriptor& descriptor, JS::Value value);
diff --git a/Userland/Libraries/LibWeb/WebAudio/AudioContext.cpp b/Userland/Libraries/LibWeb/WebAudio/AudioContext.cpp
index af44cf9a4b..7efec8c8db 100644
--- a/Userland/Libraries/LibWeb/WebAudio/AudioContext.cpp
+++ b/Userland/Libraries/LibWeb/WebAudio/AudioContext.cpp
@@ -12,6 +12,8 @@
 
 namespace Web::WebAudio {
 
+JS_DEFINE_ALLOCATOR(AudioContext);
+
 // https://webaudio.github.io/web-audio-api/#dom-audiocontext-audiocontext
 WebIDL::ExceptionOr<JS::NonnullGCPtr<AudioContext>> AudioContext::construct_impl(JS::Realm& realm, AudioContextOptions const& context_options)
 {
diff --git a/Userland/Libraries/LibWeb/WebAudio/AudioContext.h b/Userland/Libraries/LibWeb/WebAudio/AudioContext.h
index 8cdfa7aa52..835c0c4040 100644
--- a/Userland/Libraries/LibWeb/WebAudio/AudioContext.h
+++ b/Userland/Libraries/LibWeb/WebAudio/AudioContext.h
@@ -25,6 +25,7 @@ struct AudioTimestamp {
 // https://webaudio.github.io/web-audio-api/#AudioContext
 class AudioContext final : public BaseAudioContext {
     WEB_PLATFORM_OBJECT(AudioContext, BaseAudioContext);
+    JS_DECLARE_ALLOCATOR(AudioContext);
 
 public:
     static WebIDL::ExceptionOr<JS::NonnullGCPtr<AudioContext>> construct_impl(JS::Realm&, AudioContextOptions const& context_options = {});
diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.cpp b/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.cpp
index 2049bc3383..6716ca2bf3 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.cpp
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::WebGL {
 
+JS_DEFINE_ALLOCATOR(WebGLContextEvent);
+
 JS::NonnullGCPtr<WebGLContextEvent> WebGLContextEvent::create(JS::Realm& realm, FlyString const& event_name, WebGLContextEventInit const& event_init)
 {
     return realm.heap().allocate<WebGLContextEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.h b/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.h
index a4dad188e3..719db17fa2 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.h
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLContextEvent.h
@@ -18,6 +18,7 @@ struct WebGLContextEventInit final : public DOM::EventInit {
 
 class WebGLContextEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(WebGLContextEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(WebGLContextEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<WebGLContextEvent> create(JS::Realm&, FlyString const& type, WebGLContextEventInit const&);
diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp
index 76e5a2a767..2596ce27b7 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp
@@ -13,6 +13,8 @@
 
 namespace Web::WebGL {
 
+JS_DEFINE_ALLOCATOR(WebGLRenderingContext);
+
 // https://www.khronos.org/registry/webgl/specs/latest/1.0/#fire-a-webgl-context-event
 static void fire_webgl_context_event(HTML::HTMLCanvasElement& canvas_element, FlyString const& type)
 {
diff --git a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.h b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.h
index b31a6742ee..3312e453cc 100644
--- a/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.h
+++ b/Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.h
@@ -14,6 +14,7 @@ namespace Web::WebGL {
 
 class WebGLRenderingContext final : public WebGLRenderingContextBase {
     WEB_PLATFORM_OBJECT(WebGLRenderingContext, WebGLRenderingContextBase);
+    JS_DECLARE_ALLOCATOR(WebGLRenderingContext);
 
 public:
     static JS::ThrowCompletionOr<JS::GCPtr<WebGLRenderingContext>> create(JS::Realm&, HTML::HTMLCanvasElement& canvas_element, JS::Value options);
diff --git a/Userland/Libraries/LibWeb/WebIDL/CallbackType.cpp b/Userland/Libraries/LibWeb/WebIDL/CallbackType.cpp
index df3292b334..5810e0cd50 100644
--- a/Userland/Libraries/LibWeb/WebIDL/CallbackType.cpp
+++ b/Userland/Libraries/LibWeb/WebIDL/CallbackType.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::WebIDL {
 
+JS_DEFINE_ALLOCATOR(CallbackType);
+
 CallbackType::CallbackType(JS::Object& callback, HTML::EnvironmentSettingsObject& callback_context, OperationReturnsPromise operation_returns_promise)
     : callback(callback)
     , callback_context(callback_context)
diff --git a/Userland/Libraries/LibWeb/WebIDL/CallbackType.h b/Userland/Libraries/LibWeb/WebIDL/CallbackType.h
index daff83ac33..dbcd8cf2f7 100644
--- a/Userland/Libraries/LibWeb/WebIDL/CallbackType.h
+++ b/Userland/Libraries/LibWeb/WebIDL/CallbackType.h
@@ -8,6 +8,7 @@
 #pragma once
 
 #include <LibJS/Heap/Cell.h>
+#include <LibJS/Heap/CellAllocator.h>
 #include <LibWeb/Forward.h>
 
 namespace Web::WebIDL {
@@ -20,6 +21,7 @@ enum class OperationReturnsPromise {
 // https://webidl.spec.whatwg.org/#idl-callback-interface
 class CallbackType final : public JS::Cell {
     JS_CELL(CallbackType, JS::Cell);
+    JS_DECLARE_ALLOCATOR(CallbackType);
 
 public:
     CallbackType(JS::Object& callback, HTML::EnvironmentSettingsObject& callback_context, OperationReturnsPromise = OperationReturnsPromise::No);
diff --git a/Userland/Libraries/LibWeb/WebIDL/DOMException.cpp b/Userland/Libraries/LibWeb/WebIDL/DOMException.cpp
index 893e642ced..79f44d2aef 100644
--- a/Userland/Libraries/LibWeb/WebIDL/DOMException.cpp
+++ b/Userland/Libraries/LibWeb/WebIDL/DOMException.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::WebIDL {
 
+JS_DEFINE_ALLOCATOR(DOMException);
+
 JS::NonnullGCPtr<DOMException> DOMException::create(JS::Realm& realm, FlyString const& name, FlyString const& message)
 {
     return realm.heap().allocate<DOMException>(realm, realm, name, message);
diff --git a/Userland/Libraries/LibWeb/WebIDL/DOMException.h b/Userland/Libraries/LibWeb/WebIDL/DOMException.h
index 229bd6d7a0..5ec14a2edd 100644
--- a/Userland/Libraries/LibWeb/WebIDL/DOMException.h
+++ b/Userland/Libraries/LibWeb/WebIDL/DOMException.h
@@ -91,6 +91,7 @@ static u16 get_legacy_code_for_name(FlyString const& name)
 // https://webidl.spec.whatwg.org/#idl-DOMException
 class DOMException final : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(DOMException, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(DOMException);
 
 public:
     static JS::NonnullGCPtr<DOMException> create(JS::Realm& realm, FlyString const& name, FlyString const& message);
diff --git a/Userland/Libraries/LibWeb/WebSockets/WebSocket.cpp b/Userland/Libraries/LibWeb/WebSockets/WebSocket.cpp
index 9904c7f113..aefb786ad5 100644
--- a/Userland/Libraries/LibWeb/WebSockets/WebSocket.cpp
+++ b/Userland/Libraries/LibWeb/WebSockets/WebSocket.cpp
@@ -26,6 +26,8 @@
 
 namespace Web::WebSockets {
 
+JS_DEFINE_ALLOCATOR(WebSocket);
+
 static RefPtr<WebSocketClientManager> s_websocket_client_manager;
 
 void WebSocketClientManager::initialize(RefPtr<WebSocketClientManager> websocket_client_manager)
diff --git a/Userland/Libraries/LibWeb/WebSockets/WebSocket.h b/Userland/Libraries/LibWeb/WebSockets/WebSocket.h
index 9d7ba33a2c..f8735e9499 100644
--- a/Userland/Libraries/LibWeb/WebSockets/WebSocket.h
+++ b/Userland/Libraries/LibWeb/WebSockets/WebSocket.h
@@ -29,6 +29,7 @@ class WebSocketClientManager;
 
 class WebSocket final : public DOM::EventTarget {
     WEB_PLATFORM_OBJECT(WebSocket, DOM::EventTarget);
+    JS_DECLARE_ALLOCATOR(WebSocket);
 
 public:
     enum class ReadyState : u16 {
diff --git a/Userland/Libraries/LibWeb/XHR/FormData.cpp b/Userland/Libraries/LibWeb/XHR/FormData.cpp
index 5689ea3fc2..d9bd3f79b9 100644
--- a/Userland/Libraries/LibWeb/XHR/FormData.cpp
+++ b/Userland/Libraries/LibWeb/XHR/FormData.cpp
@@ -15,6 +15,8 @@
 
 namespace Web::XHR {
 
+JS_DEFINE_ALLOCATOR(FormData);
+
 // https://xhr.spec.whatwg.org/#dom-formdata
 WebIDL::ExceptionOr<JS::NonnullGCPtr<FormData>> FormData::construct_impl(JS::Realm& realm, Optional<JS::NonnullGCPtr<HTML::HTMLFormElement>> form)
 {
diff --git a/Userland/Libraries/LibWeb/XHR/FormData.h b/Userland/Libraries/LibWeb/XHR/FormData.h
index 4660a208dd..5d2571eabe 100644
--- a/Userland/Libraries/LibWeb/XHR/FormData.h
+++ b/Userland/Libraries/LibWeb/XHR/FormData.h
@@ -18,6 +18,7 @@ namespace Web::XHR {
 // https://xhr.spec.whatwg.org/#interface-formdata
 class FormData : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(FormData, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(FormData);
 
 public:
     virtual ~FormData() override;
diff --git a/Userland/Libraries/LibWeb/XHR/FormDataIterator.cpp b/Userland/Libraries/LibWeb/XHR/FormDataIterator.cpp
index b27856f53b..145a26ee75 100644
--- a/Userland/Libraries/LibWeb/XHR/FormDataIterator.cpp
+++ b/Userland/Libraries/LibWeb/XHR/FormDataIterator.cpp
@@ -23,6 +23,8 @@ void Intrinsics::create_web_prototype_and_constructor<FormDataIteratorPrototype>
 
 namespace Web::XHR {
 
+JS_DEFINE_ALLOCATOR(FormDataIterator);
+
 JS::NonnullGCPtr<FormDataIterator> FormDataIterator::create(FormData const& form_data, JS::Object::PropertyKind iterator_kind)
 {
     return form_data.heap().allocate<FormDataIterator>(form_data.realm(), form_data, iterator_kind);
diff --git a/Userland/Libraries/LibWeb/XHR/FormDataIterator.h b/Userland/Libraries/LibWeb/XHR/FormDataIterator.h
index cc02aac6e1..5b9a2f21e6 100644
--- a/Userland/Libraries/LibWeb/XHR/FormDataIterator.h
+++ b/Userland/Libraries/LibWeb/XHR/FormDataIterator.h
@@ -13,6 +13,7 @@ namespace Web::XHR {
 
 class FormDataIterator : public Bindings::PlatformObject {
     WEB_PLATFORM_OBJECT(FormDataIterator, Bindings::PlatformObject);
+    JS_DECLARE_ALLOCATOR(FormDataIterator);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<FormDataIterator> create(FormData const&, JS::Object::PropertyKind iterator_kind);
diff --git a/Userland/Libraries/LibWeb/XHR/ProgressEvent.cpp b/Userland/Libraries/LibWeb/XHR/ProgressEvent.cpp
index 0fa831b13e..009a044598 100644
--- a/Userland/Libraries/LibWeb/XHR/ProgressEvent.cpp
+++ b/Userland/Libraries/LibWeb/XHR/ProgressEvent.cpp
@@ -9,6 +9,8 @@
 
 namespace Web::XHR {
 
+JS_DEFINE_ALLOCATOR(ProgressEvent);
+
 JS::NonnullGCPtr<ProgressEvent> ProgressEvent::create(JS::Realm& realm, FlyString const& event_name, ProgressEventInit const& event_init)
 {
     return realm.heap().allocate<ProgressEvent>(realm, realm, event_name, event_init);
diff --git a/Userland/Libraries/LibWeb/XHR/ProgressEvent.h b/Userland/Libraries/LibWeb/XHR/ProgressEvent.h
index 5f8c24de90..f588c06bfa 100644
--- a/Userland/Libraries/LibWeb/XHR/ProgressEvent.h
+++ b/Userland/Libraries/LibWeb/XHR/ProgressEvent.h
@@ -22,6 +22,7 @@ struct ProgressEventInit : public DOM::EventInit {
 
 class ProgressEvent final : public DOM::Event {
     WEB_PLATFORM_OBJECT(ProgressEvent, DOM::Event);
+    JS_DECLARE_ALLOCATOR(ProgressEvent);
 
 public:
     [[nodiscard]] static JS::NonnullGCPtr<ProgressEvent> create(JS::Realm&, FlyString const& event_name, ProgressEventInit const& event_init);
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
index d58c673b3a..fd6a7bed41 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.cpp
@@ -53,6 +53,8 @@
 
 namespace Web::XHR {
 
+JS_DEFINE_ALLOCATOR(XMLHttpRequest);
+
 WebIDL::ExceptionOr<JS::NonnullGCPtr<XMLHttpRequest>> XMLHttpRequest::construct_impl(JS::Realm& realm)
 {
     auto upload_object = realm.heap().allocate<XMLHttpRequestUpload>(realm, realm);
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h
index bfb0b8ba48..3b45cf9b79 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequest.h
@@ -30,6 +30,7 @@ using DocumentOrXMLHttpRequestBodyInit = Variant<JS::Handle<Web::DOM::Document>,
 
 class XMLHttpRequest final : public XMLHttpRequestEventTarget {
     WEB_PLATFORM_OBJECT(XMLHttpRequest, XMLHttpRequestEventTarget);
+    JS_DECLARE_ALLOCATOR(XMLHttpRequest);
 
 public:
     enum class State : u16 {
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.cpp b/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.cpp
index b40e88a87b..901fb638a2 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.cpp
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.cpp
@@ -10,6 +10,8 @@
 
 namespace Web::XHR {
 
+JS_DEFINE_ALLOCATOR(XMLHttpRequestUpload);
+
 XMLHttpRequestUpload::XMLHttpRequestUpload(JS::Realm& realm)
     : XMLHttpRequestEventTarget(realm)
 {
diff --git a/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.h b/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.h
index 9718fa3375..b5c22ee550 100644
--- a/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.h
+++ b/Userland/Libraries/LibWeb/XHR/XMLHttpRequestUpload.h
@@ -12,6 +12,7 @@ namespace Web::XHR {
 
 class XMLHttpRequestUpload : public XMLHttpRequestEventTarget {
     WEB_PLATFORM_OBJECT(XMLHttpRequestUpload, XMLHttpRequestEventTarget);
+    JS_DECLARE_ALLOCATOR(XMLHttpRequestUpload);
 
 public:
     virtual ~XMLHttpRequestUpload() override;