LibJS: Make Cell::initialize() return void

Stop worrying about tiny OOMs.

Work towards #20405

Userland/Libraries/LibWeb/Bindings/AudioConstructor.cpp

@@ -19,15 +19,13 @@ AudioConstructor::AudioConstructor(JS::Realm& realm)
 {
 }
 
-JS::ThrowCompletionOr<void> AudioConstructor::initialize(JS::Realm& realm)
+void AudioConstructor::initialize(JS::Realm& realm)
 {
     auto& vm = this->vm();
-    MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
+    Base::initialize(realm);
 
     define_direct_property(vm.names.prototype, &ensure_web_prototype<Bindings::HTMLAudioElementPrototype>(realm, "HTMLAudioElement"), 0);
     define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
-
-    return {};
 }
 
 JS::ThrowCompletionOr<JS::Value> AudioConstructor::call()

Userland/Libraries/LibWeb/Bindings/AudioConstructor.h

@@ -14,7 +14,7 @@ namespace Web::Bindings {
 class AudioConstructor final : public JS::NativeFunction {
 public:
     explicit AudioConstructor(JS::Realm&);
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual ~AudioConstructor() override = default;
 
     virtual JS::ThrowCompletionOr<JS::Value> call() override;

Userland/Libraries/LibWeb/Bindings/ImageConstructor.cpp

@@ -19,15 +19,13 @@ ImageConstructor::ImageConstructor(JS::Realm& realm)
 {
 }
 
-JS::ThrowCompletionOr<void> ImageConstructor::initialize(JS::Realm& realm)
+void ImageConstructor::initialize(JS::Realm& realm)
 {
     auto& vm = this->vm();
+    Base::initialize(realm);
 
-    MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
     define_direct_property(vm.names.prototype, &ensure_web_prototype<Bindings::HTMLImageElementPrototype>(realm, "HTMLImageElement"), 0);
     define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
-
-    return {};
 }
 
 JS::ThrowCompletionOr<JS::Value> ImageConstructor::call()

Userland/Libraries/LibWeb/Bindings/ImageConstructor.h

@@ -14,7 +14,7 @@ namespace Web::Bindings {
 class ImageConstructor final : public JS::NativeFunction {
 public:
     explicit ImageConstructor(JS::Realm&);
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual ~ImageConstructor() override = default;
 
     virtual JS::ThrowCompletionOr<JS::Value> call() override;

Userland/Libraries/LibWeb/Bindings/OptionConstructor.cpp

@@ -21,15 +21,13 @@ OptionConstructor::OptionConstructor(JS::Realm& realm)
 {
 }
 
-JS::ThrowCompletionOr<void> OptionConstructor::initialize(JS::Realm& realm)
+void OptionConstructor::initialize(JS::Realm& realm)
 {
     auto& vm = this->vm();
+    Base::initialize(realm);
 
-    MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
     define_direct_property(vm.names.prototype, &ensure_web_prototype<Bindings::HTMLOptionElementPrototype>(realm, "HTMLOptionElement"), 0);
     define_direct_property(vm.names.length, JS::Value(0), JS::Attribute::Configurable);
-
-    return {};
 }
 
 JS::ThrowCompletionOr<JS::Value> OptionConstructor::call()

Userland/Libraries/LibWeb/Bindings/OptionConstructor.h

@@ -14,7 +14,7 @@ namespace Web::Bindings {
 class OptionConstructor final : public JS::NativeFunction {
 public:
     explicit OptionConstructor(JS::Realm&);
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual ~OptionConstructor() override = default;
 
     virtual JS::ThrowCompletionOr<JS::Value> call() override;

Userland/Libraries/LibWeb/CSS/CSSConditionRule.cpp

@@ -28,12 +28,10 @@ void CSSConditionRule::for_each_effective_keyframes_at_rule(Function<void(CSSKey
         CSSGroupingRule::for_each_effective_keyframes_at_rule(callback);
 }
 
-JS::ThrowCompletionOr<void> CSSConditionRule::initialize(JS::Realm& realm)
+void CSSConditionRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSConditionRulePrototype>(realm, "CSSConditionRule"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/CSS/CSSConditionRule.h

@@ -28,7 +28,7 @@ public:
 protected:
     CSSConditionRule(JS::Realm&, CSSRuleList&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 };
 
 }

Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.cpp

@@ -25,12 +25,10 @@ CSSFontFaceRule::CSSFontFaceRule(JS::Realm& realm, FontFace&& font_face)
 {
 }
 
-JS::ThrowCompletionOr<void> CSSFontFaceRule::initialize(JS::Realm& realm)
+void CSSFontFaceRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSFontFaceRulePrototype>(realm, "CSSFontFaceRule"));
-
-    return {};
 }
 
 CSSStyleDeclaration* CSSFontFaceRule::style()

Userland/Libraries/LibWeb/CSS/CSSFontFaceRule.h

@@ -28,7 +28,7 @@ public:
 private:
     CSSFontFaceRule(JS::Realm&, FontFace&&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual DeprecatedString serialized() const override;
 
     FontFace m_font_face;

Userland/Libraries/LibWeb/CSS/CSSGroupingRule.cpp

@@ -22,12 +22,10 @@ CSSGroupingRule::CSSGroupingRule(JS::Realm& realm, CSSRuleList& rules)
         rule->set_parent_rule(this);
 }
 
-JS::ThrowCompletionOr<void> CSSGroupingRule::initialize(JS::Realm& realm)
+void CSSGroupingRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSGroupingRulePrototype>(realm, "CSSGroupingRule"));
-
-    return {};
 }
 
 void CSSGroupingRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSGroupingRule.h

@@ -34,7 +34,7 @@ public:
 protected:
     CSSGroupingRule(JS::Realm&, CSSRuleList&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
 private:

Userland/Libraries/LibWeb/CSS/CSSImportRule.cpp

@@ -40,12 +40,10 @@ CSSImportRule::CSSImportRule(AK::URL url, DOM::Document& document)
     set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
 }
 
-JS::ThrowCompletionOr<void> CSSImportRule::initialize(JS::Realm& realm)
+void CSSImportRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSImportRulePrototype>(realm, "CSSImportRule"));
-
-    return {};
 }
 
 void CSSImportRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSImportRule.h

@@ -40,7 +40,7 @@ public:
 private:
     CSSImportRule(AK::URL, DOM::Document&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     virtual DeprecatedString serialized() const override;

Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.cpp

@@ -22,11 +22,10 @@ void CSSKeyframeRule::visit_edges(Visitor& visitor)
     visitor.visit(m_declarations);
 }
 
-JS::ThrowCompletionOr<void> CSSKeyframeRule::initialize(JS::Realm& realm)
+void CSSKeyframeRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSKeyframeRulePrototype>(realm, "CSSKeyframeRule"));
-    return {};
 }
 
 DeprecatedString CSSKeyframeRule::serialized() const

Userland/Libraries/LibWeb/CSS/CSSKeyframeRule.h

@@ -48,7 +48,7 @@ private:
     }
 
     virtual void visit_edges(Visitor&) override;
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual DeprecatedString serialized() const override;
 
     CSS::Percentage m_key;

Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.cpp

@@ -22,12 +22,10 @@ void CSSKeyframesRule::visit_edges(Visitor& visitor)
         visitor.visit(keyframe);
 }
 
-JS::ThrowCompletionOr<void> CSSKeyframesRule::initialize(JS::Realm& realm)
+void CSSKeyframesRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSKeyframesRulePrototype>(realm, "CSSKeyframesRule"));
-
-    return {};
 }
 
 DeprecatedString CSSKeyframesRule::serialized() const

Userland/Libraries/LibWeb/CSS/CSSKeyframesRule.h

@@ -46,7 +46,7 @@ private:
 
     virtual void visit_edges(Visitor&) override;
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual DeprecatedString serialized() const override;
 
     FlyString m_name;

Userland/Libraries/LibWeb/CSS/CSSMediaRule.cpp

@@ -23,12 +23,10 @@ CSSMediaRule::CSSMediaRule(JS::Realm& realm, MediaList& media, CSSRuleList& rule
 {
 }
 
-JS::ThrowCompletionOr<void> CSSMediaRule::initialize(JS::Realm& realm)
+void CSSMediaRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSMediaRulePrototype>(realm, "CSSMediaRule"));
-
-    return {};
 }
 
 void CSSMediaRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSMediaRule.h

@@ -35,7 +35,7 @@ public:
 private:
     CSSMediaRule(JS::Realm&, MediaList&, CSSRuleList&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
     virtual DeprecatedString serialized() const override;
 

Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.cpp

@@ -25,12 +25,10 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSNamespaceRule>> CSSNamespaceRule::create
     return MUST_OR_THROW_OOM(realm.heap().allocate<CSSNamespaceRule>(realm, realm, prefix, namespace_uri));
 }
 
-JS::ThrowCompletionOr<void> CSSNamespaceRule::initialize(JS::Realm& realm)
+void CSSNamespaceRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSNamespaceRulePrototype>(realm, "CSSNamespaceRule"));
-
-    return {};
 }
 
 // https://www.w3.org/TR/cssom/#serialize-a-css-rule

Userland/Libraries/LibWeb/CSS/CSSNamespaceRule.h

@@ -27,7 +27,7 @@ public:
 private:
     CSSNamespaceRule(JS::Realm&, Optional<StringView> prefix, StringView namespace_uri);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     virtual DeprecatedString serialized() const override;
     DeprecatedString m_namespace_uri;

Userland/Libraries/LibWeb/CSS/CSSRuleList.cpp

@@ -36,12 +36,10 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<CSSRuleList>> CSSRuleList::create_empty(JS:
     return MUST_OR_THROW_OOM(realm.heap().allocate<CSSRuleList>(realm, realm));
 }
 
-JS::ThrowCompletionOr<void> CSSRuleList::initialize(JS::Realm& realm)
+void CSSRuleList::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSRuleListPrototype>(realm, "CSSRuleList"));
-
-    return {};
 }
 
 void CSSRuleList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSRuleList.h

@@ -66,7 +66,7 @@ public:
 private:
     explicit CSSRuleList(JS::Realm&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     // ^Bindings::LegacyPlatformObject

Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.cpp

@@ -20,11 +20,10 @@ CSSStyleDeclaration::CSSStyleDeclaration(JS::Realm& realm)
 {
 }
 
-JS::ThrowCompletionOr<void> CSSStyleDeclaration::initialize(JS::Realm& realm)
+void CSSStyleDeclaration::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSStyleDeclarationPrototype>(realm, "CSSStyleDeclaration"));
-    return {};
 }
 
 WebIDL::ExceptionOr<JS::NonnullGCPtr<PropertyOwningCSSStyleDeclaration>> PropertyOwningCSSStyleDeclaration::create(JS::Realm& realm, Vector<StyleProperty> properties, HashMap<DeprecatedString, StyleProperty> custom_properties)

Userland/Libraries/LibWeb/CSS/CSSStyleDeclaration.h

@@ -19,7 +19,7 @@ class CSSStyleDeclaration : public Bindings::PlatformObject {
 
 public:
     virtual ~CSSStyleDeclaration() = default;
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     virtual size_t length() const = 0;
     virtual DeprecatedString item(size_t index) const = 0;

Userland/Libraries/LibWeb/CSS/CSSStyleRule.cpp

@@ -24,12 +24,10 @@ CSSStyleRule::CSSStyleRule(JS::Realm& realm, Vector<NonnullRefPtr<Selector>>&& s
 {
 }
 
-JS::ThrowCompletionOr<void> CSSStyleRule::initialize(JS::Realm& realm)
+void CSSStyleRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSStyleRulePrototype>(realm, "CSSStyleRule"));
-
-    return {};
 }
 
 void CSSStyleRule::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSStyleRule.h

@@ -35,7 +35,7 @@ public:
 private:
     CSSStyleRule(JS::Realm&, Vector<NonnullRefPtr<Selector>>&&, CSSStyleDeclaration&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
     virtual DeprecatedString serialized() const override;
 

Userland/Libraries/LibWeb/CSS/CSSStyleSheet.cpp

@@ -37,12 +37,10 @@ CSSStyleSheet::CSSStyleSheet(JS::Realm& realm, CSSRuleList& rules, MediaList& me
     };
 }
 
-JS::ThrowCompletionOr<void> CSSStyleSheet::initialize(JS::Realm& realm)
+void CSSStyleSheet::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSStyleSheetPrototype>(realm, "CSSStyleSheet"));
-
-    return {};
 }
 
 void CSSStyleSheet::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/CSSStyleSheet.h

@@ -54,7 +54,7 @@ public:
 private:
     CSSStyleSheet(JS::Realm&, CSSRuleList&, MediaList&, Optional<AK::URL> location);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     void recalculate_namespaces();

Userland/Libraries/LibWeb/CSS/CSSSupportsRule.cpp

@@ -22,12 +22,10 @@ CSSSupportsRule::CSSSupportsRule(JS::Realm& realm, NonnullRefPtr<Supports>&& sup
 {
 }
 
-JS::ThrowCompletionOr<void> CSSSupportsRule::initialize(JS::Realm& realm)
+void CSSSupportsRule::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSSupportsRulePrototype>(realm, "CSSSupportsRule"));
-
-    return {};
 }
 
 DeprecatedString CSSSupportsRule::condition_text() const

Userland/Libraries/LibWeb/CSS/CSSSupportsRule.h

@@ -32,7 +32,7 @@ public:
 private:
     CSSSupportsRule(JS::Realm&, NonnullRefPtr<Supports>&&, CSSRuleList&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual DeprecatedString serialized() const override;
 
     NonnullRefPtr<Supports> m_supports;

Userland/Libraries/LibWeb/CSS/MediaList.cpp

@@ -24,12 +24,10 @@ MediaList::MediaList(JS::Realm& realm, Vector<NonnullRefPtr<MediaQuery>>&& media
 {
 }
 
-JS::ThrowCompletionOr<void> MediaList::initialize(JS::Realm& realm)
+void MediaList::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaListPrototype>(realm, "MediaList"));
-
-    return {};
 }
 
 // https://www.w3.org/TR/cssom-1/#dom-medialist-mediatext

Userland/Libraries/LibWeb/CSS/MediaList.h

@@ -39,7 +39,7 @@ public:
 private:
     MediaList(JS::Realm&, Vector<NonnullRefPtr<MediaQuery>>&&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     // ^Bindings::LegacyPlatformObject
     virtual bool supports_indexed_properties() const override { return true; }

Userland/Libraries/LibWeb/CSS/MediaQueryList.cpp

@@ -28,12 +28,10 @@ MediaQueryList::MediaQueryList(DOM::Document& document, Vector<NonnullRefPtr<Med
     evaluate();
 }
 
-JS::ThrowCompletionOr<void> MediaQueryList::initialize(JS::Realm& realm)
+void MediaQueryList::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaQueryListPrototype>(realm, "MediaQueryList"));
-
-    return {};
 }
 
 void MediaQueryList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/MediaQueryList.h

@@ -34,7 +34,7 @@ public:
 private:
     MediaQueryList(DOM::Document&, Vector<NonnullRefPtr<MediaQuery>>&&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     JS::NonnullGCPtr<DOM::Document> m_document;

Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.cpp

@@ -24,12 +24,10 @@ MediaQueryListEvent::MediaQueryListEvent(JS::Realm& realm, FlyString const& even
 
 MediaQueryListEvent::~MediaQueryListEvent() = default;
 
-JS::ThrowCompletionOr<void> MediaQueryListEvent::initialize(JS::Realm& realm)
+void MediaQueryListEvent::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MediaQueryListEventPrototype>(realm, "MediaQueryListEvent"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/CSS/MediaQueryListEvent.h

@@ -30,7 +30,7 @@ public:
 private:
     MediaQueryListEvent(JS::Realm&, FlyString const& event_name, MediaQueryListEventInit const& event_init);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     String m_media;
     bool m_matches;

Userland/Libraries/LibWeb/CSS/Screen.cpp

@@ -24,12 +24,10 @@ Screen::Screen(HTML::Window& window)
 {
 }
 
-JS::ThrowCompletionOr<void> Screen::initialize(JS::Realm& realm)
+void Screen::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::ScreenPrototype>(realm, "Screen"));
-
-    return {};
 }
 
 void Screen::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/Screen.h

@@ -29,7 +29,7 @@ public:
 private:
     explicit Screen(HTML::Window&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     HTML::Window const& window() const { return *m_window; }

Userland/Libraries/LibWeb/CSS/StyleSheetList.cpp

@@ -74,12 +74,10 @@ StyleSheetList::StyleSheetList(DOM::Document& document)
 {
 }
 
-JS::ThrowCompletionOr<void> StyleSheetList::initialize(JS::Realm& realm)
+void StyleSheetList::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::StyleSheetListPrototype>(realm, "StyleSheetList"));
-
-    return {};
 }
 
 void StyleSheetList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/StyleSheetList.h

@@ -42,7 +42,7 @@ public:
 private:
     explicit StyleSheetList(DOM::Document&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     // ^Bindings::LegacyPlatformObject

Userland/Libraries/LibWeb/CSS/VisualViewport.cpp

@@ -26,12 +26,10 @@ VisualViewport::VisualViewport(DOM::Document& document)
 {
 }
 
-JS::ThrowCompletionOr<void> VisualViewport::initialize(JS::Realm& realm)
+void VisualViewport::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::VisualViewportPrototype>(realm, "VisualViewport"));
-
-    return {};
 }
 
 void VisualViewport::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/CSS/VisualViewport.h

@@ -40,7 +40,7 @@ public:
 private:
     explicit VisualViewport(DOM::Document&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     JS::NonnullGCPtr<DOM::Document> m_document;

Userland/Libraries/LibWeb/Crypto/Crypto.cpp

@@ -27,15 +27,11 @@ Crypto::Crypto(JS::Realm& realm)
 
 Crypto::~Crypto() = default;
 
-JS::ThrowCompletionOr<void> Crypto::initialize(JS::Realm& realm)
+void Crypto::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CryptoPrototype>(realm, "Crypto"));
-    m_subtle = TRY(Bindings::throw_dom_exception_if_needed(realm.vm(), [&]() {
-        return SubtleCrypto::create(realm);
-    }));
-
-    return {};
+    m_subtle = MUST(SubtleCrypto::create(realm));
 }
 
 JS::NonnullGCPtr<SubtleCrypto> Crypto::subtle() const

Userland/Libraries/LibWeb/Crypto/Crypto.h

@@ -26,7 +26,7 @@ public:
     WebIDL::ExceptionOr<String> random_uuid() const;
 
 protected:
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
 private:

Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp

@@ -26,12 +26,10 @@ SubtleCrypto::SubtleCrypto(JS::Realm& realm)
 
 SubtleCrypto::~SubtleCrypto() = default;
 
-JS::ThrowCompletionOr<void> SubtleCrypto::initialize(JS::Realm& realm)
+void SubtleCrypto::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::SubtleCryptoPrototype>(realm, "SubtleCrypto"));
-
-    return {};
 }
 
 // https://w3c.github.io/webcrypto/#dfn-SubtleCrypto-method-digest

Userland/Libraries/LibWeb/Crypto/SubtleCrypto.h

@@ -23,7 +23,7 @@ public:
 
 private:
     explicit SubtleCrypto(JS::Realm&);
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 };
 
 }

Userland/Libraries/LibWeb/DOM/AbortController.cpp

@@ -25,12 +25,10 @@ AbortController::AbortController(JS::Realm& realm, JS::NonnullGCPtr<AbortSignal>
 
 AbortController::~AbortController() = default;
 
-JS::ThrowCompletionOr<void> AbortController::initialize(JS::Realm& realm)
+void AbortController::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::AbortControllerPrototype>(realm, "AbortController"));
-
-    return {};
 }
 
 void AbortController::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/AbortController.h

@@ -28,7 +28,7 @@ public:
 private:
     AbortController(JS::Realm&, JS::NonnullGCPtr<AbortSignal>);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     // https://dom.spec.whatwg.org/#abortcontroller-signal

Userland/Libraries/LibWeb/DOM/AbortSignal.cpp

@@ -22,12 +22,10 @@ AbortSignal::AbortSignal(JS::Realm& realm)
 {
 }
 
-JS::ThrowCompletionOr<void> AbortSignal::initialize(JS::Realm& realm)
+void AbortSignal::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::AbortSignalPrototype>(realm, "AbortSignal"));
-
-    return {};
 }
 
 // https://dom.spec.whatwg.org/#abortsignal-add

Userland/Libraries/LibWeb/DOM/AbortSignal.h

@@ -43,7 +43,7 @@ public:
 private:
     explicit AbortSignal(JS::Realm&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(JS::Cell::Visitor&) override;
 
     // https://dom.spec.whatwg.org/#abortsignal-abort-reason

Userland/Libraries/LibWeb/DOM/AbstractRange.cpp

@@ -21,12 +21,10 @@ AbstractRange::AbstractRange(Node& start_container, u32 start_offset, Node& end_
 
 AbstractRange::~AbstractRange() = default;
 
-JS::ThrowCompletionOr<void> AbstractRange::initialize(JS::Realm& realm)
+void AbstractRange::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::AbstractRangePrototype>(realm, "AbstractRange"));
-
-    return {};
 }
 
 void AbstractRange::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/AbstractRange.h

@@ -36,7 +36,7 @@ public:
 protected:
     AbstractRange(Node& start_container, u32 start_offset, Node& end_container, u32 end_offset);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     JS::NonnullGCPtr<Node> m_start_container;

Userland/Libraries/LibWeb/DOM/Attr.cpp

@@ -38,12 +38,10 @@ Attr::Attr(Document& document, QualifiedName qualified_name, DeprecatedString va
 {
 }
 
-JS::ThrowCompletionOr<void> Attr::initialize(JS::Realm& realm)
+void Attr::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::AttrPrototype>(realm, "Attr"));
-
-    return {};
 }
 
 void Attr::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/Attr.h

@@ -46,7 +46,7 @@ public:
 private:
     Attr(Document&, QualifiedName, DeprecatedString value, Element*);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     QualifiedName m_qualified_name;

Userland/Libraries/LibWeb/DOM/CDATASection.cpp

@@ -16,12 +16,10 @@ CDATASection::CDATASection(Document& document, DeprecatedString const& data)
 
 CDATASection::~CDATASection() = default;
 
-JS::ThrowCompletionOr<void> CDATASection::initialize(JS::Realm& realm)
+void CDATASection::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CDATASectionPrototype>(realm, "CDATASection"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/DOM/CDATASection.h

@@ -23,7 +23,7 @@ public:
 private:
     CDATASection(Document&, DeprecatedString const&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 };
 
 template<>

Userland/Libraries/LibWeb/DOM/CharacterData.cpp

@@ -19,12 +19,10 @@ CharacterData::CharacterData(Document& document, NodeType type, DeprecatedString
 {
 }
 
-JS::ThrowCompletionOr<void> CharacterData::initialize(JS::Realm& realm)
+void CharacterData::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CharacterDataPrototype>(realm, "CharacterData"));
-
-    return {};
 }
 
 // https://dom.spec.whatwg.org/#dom-characterdata-data

Userland/Libraries/LibWeb/DOM/CharacterData.h

@@ -36,7 +36,7 @@ public:
 protected:
     CharacterData(Document&, NodeType, DeprecatedString const&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
 private:
     DeprecatedString m_data;

Userland/Libraries/LibWeb/DOM/Comment.cpp

@@ -23,12 +23,10 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<Comment>> Comment::construct_impl(JS::Realm
     return MUST_OR_THROW_OOM(realm.heap().allocate<Comment>(realm, window.associated_document(), data));
 }
 
-JS::ThrowCompletionOr<void> Comment::initialize(JS::Realm& realm)
+void Comment::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CommentPrototype>(realm, "Comment"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/DOM/Comment.h

@@ -23,7 +23,7 @@ public:
 private:
     Comment(Document&, DeprecatedString const&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 };
 
 template<>

Userland/Libraries/LibWeb/DOM/CustomEvent.cpp

@@ -29,12 +29,10 @@ CustomEvent::CustomEvent(JS::Realm& realm, FlyString const& event_name, CustomEv
 
 CustomEvent::~CustomEvent() = default;
 
-JS::ThrowCompletionOr<void> CustomEvent::initialize(JS::Realm& realm)
+void CustomEvent::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::CustomEventPrototype>(realm, "CustomEvent"));
-
-    return {};
 }
 
 void CustomEvent::visit_edges(JS::Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/CustomEvent.h

@@ -29,7 +29,7 @@ public:
     // https://dom.spec.whatwg.org/#dom-customevent-detail
     JS::Value detail() const { return m_detail; }
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(JS::Cell::Visitor&) override;
 
     void init_custom_event(String const& type, bool bubbles, bool cancelable, JS::Value detail);

Userland/Libraries/LibWeb/DOM/DOMImplementation.cpp

@@ -31,12 +31,10 @@ DOMImplementation::DOMImplementation(Document& document)
 
 DOMImplementation::~DOMImplementation() = default;
 
-JS::ThrowCompletionOr<void> DOMImplementation::initialize(JS::Realm& realm)
+void DOMImplementation::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::DOMImplementationPrototype>(realm, "DOMImplementation"));
-
-    return {};
 }
 
 void DOMImplementation::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/DOMImplementation.h

@@ -30,7 +30,7 @@ public:
 private:
     explicit DOMImplementation(Document&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     Document& document() { return m_document; }

Userland/Libraries/LibWeb/DOM/DOMTokenList.cpp

@@ -68,12 +68,10 @@ DOMTokenList::DOMTokenList(Element& associated_element, DeprecatedFlyString asso
     associated_attribute_changed(value);
 }
 
-JS::ThrowCompletionOr<void> DOMTokenList::initialize(JS::Realm& realm)
+void DOMTokenList::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::DOMTokenListPrototype>(realm, "DOMTokenList"));
-
-    return {};
 }
 
 void DOMTokenList::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/DOMTokenList.h

@@ -46,7 +46,7 @@ public:
 private:
     DOMTokenList(Element& associated_element, DeprecatedFlyString associated_attribute);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     // ^Bindings::LegacyPlatformObject

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -336,16 +336,14 @@ Document::~Document()
     HTML::main_thread_event_loop().unregister_document({}, *this);
 }
 
-JS::ThrowCompletionOr<void> Document::initialize(JS::Realm& realm)
+void Document::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::DocumentPrototype>(realm, "Document"));
 
-    m_selection = MUST_OR_THROW_OOM(heap().allocate<Selection::Selection>(realm, realm, *this));
+    m_selection = MUST(heap().allocate<Selection::Selection>(realm, realm, *this));
 
-    m_list_of_available_images = TRY_OR_THROW_OOM(realm.vm(), try_make<HTML::ListOfAvailableImages>());
-
-    return {};
+    m_list_of_available_images = make<HTML::ListOfAvailableImages>();
 }
 
 void Document::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/Document.h

@@ -500,7 +500,7 @@ public:
     void shared_declarative_refresh_steps(StringView input, JS::GCPtr<HTML::HTMLMetaElement const> meta_element = nullptr);
 
 protected:
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     Document(JS::Realm&, AK::URL const&);

Userland/Libraries/LibWeb/DOM/DocumentFragment.cpp

@@ -14,12 +14,10 @@ DocumentFragment::DocumentFragment(Document& document)
 {
 }
 
-JS::ThrowCompletionOr<void> DocumentFragment::initialize(JS::Realm& realm)
+void DocumentFragment::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::DocumentFragmentPrototype>(realm, "DocumentFragment"));
-
-    return {};
 }
 
 void DocumentFragment::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/DocumentFragment.h

@@ -33,7 +33,7 @@ public:
 protected:
     explicit DocumentFragment(Document& document);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
 private:

Userland/Libraries/LibWeb/DOM/DocumentType.cpp

@@ -19,12 +19,10 @@ DocumentType::DocumentType(Document& document)
 {
 }
 
-JS::ThrowCompletionOr<void> DocumentType::initialize(JS::Realm& realm)
+void DocumentType::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::DocumentTypePrototype>(realm, "DocumentType"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/DOM/DocumentType.h

@@ -36,7 +36,7 @@ public:
 private:
     explicit DocumentType(Document&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     DeprecatedString m_name;
     DeprecatedString m_public_id;

Userland/Libraries/LibWeb/DOM/Element.cpp

@@ -70,16 +70,12 @@ Element::Element(Document& document, DOM::QualifiedName qualified_name)
 
 Element::~Element() = default;
 
-JS::ThrowCompletionOr<void> Element::initialize(JS::Realm& realm)
+void Element::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::ElementPrototype>(realm, "Element"));
 
-    m_attributes = TRY(Bindings::throw_dom_exception_if_needed(realm.vm(), [&]() {
-        return NamedNodeMap::create(*this);
-    }));
-
-    return {};
+    m_attributes = MUST(NamedNodeMap::create(*this));
 }
 
 void Element::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/Element.h

@@ -324,7 +324,7 @@ public:
 
 protected:
     Element(Document&, DOM::QualifiedName);
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     virtual void children_changed() override;
     virtual i32 default_tab_index_value() const;

Userland/Libraries/LibWeb/DOM/Event.cpp

@@ -41,12 +41,10 @@ Event::Event(JS::Realm& realm, FlyString const& type, EventInit const& event_ini
 {
 }
 
-JS::ThrowCompletionOr<void> Event::initialize(JS::Realm& realm)
+void Event::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::EventPrototype>(realm, "Event"));
-
-    return {};
 }
 
 void Event::visit_edges(Visitor& visitor)

Userland/Libraries/LibWeb/DOM/Event.h

@@ -146,7 +146,7 @@ public:
 protected:
     void initialize_event(String const&, bool, bool);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Visitor&) override;
 
 private:

Userland/Libraries/LibWeb/DOM/EventTarget.cpp

@@ -52,16 +52,14 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<EventTarget>> EventTarget::construct_impl(J
     return MUST_OR_THROW_OOM(realm.heap().allocate<EventTarget>(realm, realm));
 }
 
-JS::ThrowCompletionOr<void> EventTarget::initialize(JS::Realm& realm)
+void EventTarget::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
 
     // FIXME: We can't do this for HTML::Window currently, as this will run when creating the initial global object.
     //        During this time, the ESO is not setup, so it will cause a nullptr dereference in host_defined_intrinsics.
     if (!is<HTML::Window>(this))
         set_prototype(&Bindings::ensure_web_prototype<Bindings::EventTargetPrototype>(realm, "EventTarget"));
-
-    return {};
 }
 
 void EventTarget::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/EventTarget.h

@@ -64,7 +64,7 @@ protected:
 
     void element_event_handler_attribute_changed(FlyString const& local_name, Optional<String> const& value);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
 private:

Userland/Libraries/LibWeb/DOM/HTMLCollection.cpp

@@ -28,12 +28,10 @@ HTMLCollection::HTMLCollection(ParentNode& root, Scope scope, Function<bool(Elem
 
 HTMLCollection::~HTMLCollection() = default;
 
-JS::ThrowCompletionOr<void> HTMLCollection::initialize(JS::Realm& realm)
+void HTMLCollection::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLCollectionPrototype>(realm, "HTMLCollection"));
-
-    return {};
 }
 
 void HTMLCollection::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/HTMLCollection.h

@@ -52,7 +52,7 @@ public:
 protected:
     HTMLCollection(ParentNode& root, Scope, Function<bool(Element const&)> filter);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     JS::NonnullGCPtr<ParentNode> root() { return *m_root; }
 

Userland/Libraries/LibWeb/DOM/MutationObserver.cpp

@@ -31,12 +31,10 @@ MutationObserver::MutationObserver(JS::Realm& realm, JS::GCPtr<WebIDL::CallbackT
 
 MutationObserver::~MutationObserver() = default;
 
-JS::ThrowCompletionOr<void> MutationObserver::initialize(JS::Realm& realm)
+void MutationObserver::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MutationObserverPrototype>(realm, "MutationObserver"));
-
-    return {};
 }
 
 void MutationObserver::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/MutationObserver.h

@@ -51,7 +51,7 @@ public:
 private:
     MutationObserver(JS::Realm&, JS::GCPtr<WebIDL::CallbackType>);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     // https://dom.spec.whatwg.org/#concept-mo-callback

Userland/Libraries/LibWeb/DOM/MutationRecord.cpp

@@ -33,12 +33,10 @@ MutationRecord::MutationRecord(JS::Realm& realm, FlyString const& type, Node con
 
 MutationRecord::~MutationRecord() = default;
 
-JS::ThrowCompletionOr<void> MutationRecord::initialize(JS::Realm& realm)
+void MutationRecord::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::MutationRecordPrototype>(realm, "MutationRecord"));
-
-    return {};
 }
 
 void MutationRecord::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/MutationRecord.h

@@ -33,7 +33,7 @@ public:
 private:
     MutationRecord(JS::Realm& realm, FlyString const& type, Node const& target, NodeList& added_nodes, NodeList& removed_nodes, Node* previous_sibling, Node* next_sibling, DeprecatedString const& attribute_name, DeprecatedString const& attribute_namespace, DeprecatedString const& old_value);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     FlyString m_type;

Userland/Libraries/LibWeb/DOM/NamedNodeMap.cpp

@@ -25,12 +25,10 @@ NamedNodeMap::NamedNodeMap(Element& element)
 {
 }
 
-JS::ThrowCompletionOr<void> NamedNodeMap::initialize(JS::Realm& realm)
+void NamedNodeMap::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::NamedNodeMapPrototype>(realm, "NamedNodeMap"));
-
-    return {};
 }
 
 void NamedNodeMap::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/NamedNodeMap.h

@@ -56,7 +56,7 @@ public:
 private:
     explicit NamedNodeMap(Element&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     // ^Bindings::LegacyPlatformObject

Userland/Libraries/LibWeb/DOM/NodeIterator.cpp

@@ -21,12 +21,10 @@ NodeIterator::NodeIterator(Node& root)
 
 NodeIterator::~NodeIterator() = default;
 
-JS::ThrowCompletionOr<void> NodeIterator::initialize(JS::Realm& realm)
+void NodeIterator::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::NodeIteratorPrototype>(realm, "NodeIterator"));
-
-    return {};
 }
 
 void NodeIterator::finalize()

Userland/Libraries/LibWeb/DOM/NodeIterator.h

@@ -37,7 +37,7 @@ public:
 private:
     explicit NodeIterator(Node& root);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
     virtual void finalize() override;
 

Userland/Libraries/LibWeb/DOM/NodeList.cpp

@@ -17,12 +17,10 @@ NodeList::NodeList(JS::Realm& realm)
 
 NodeList::~NodeList() = default;
 
-JS::ThrowCompletionOr<void> NodeList::initialize(JS::Realm& realm)
+void NodeList::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::NodeListPrototype>(realm, "NodeList"));
-
-    return {};
 }
 
 WebIDL::ExceptionOr<JS::Value> NodeList::item_value(size_t index) const

Userland/Libraries/LibWeb/DOM/NodeList.h

@@ -27,7 +27,7 @@ public:
 protected:
     explicit NodeList(JS::Realm&);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     // ^Bindings::LegacyPlatformObject
     virtual bool supports_indexed_properties() const final override { return true; }

Userland/Libraries/LibWeb/DOM/ProcessingInstruction.cpp

@@ -17,12 +17,10 @@ ProcessingInstruction::ProcessingInstruction(Document& document, DeprecatedStrin
 {
 }
 
-JS::ThrowCompletionOr<void> ProcessingInstruction::initialize(JS::Realm& realm)
+void ProcessingInstruction::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::ProcessingInstructionPrototype>(realm, "ProcessingInstruction"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/DOM/ProcessingInstruction.h

@@ -24,7 +24,7 @@ public:
 private:
     ProcessingInstruction(Document&, DeprecatedString const& data, DeprecatedString const& target);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     DeprecatedString m_target;
 };

Userland/Libraries/LibWeb/DOM/Range.cpp

@@ -70,12 +70,10 @@ Range::~Range()
     live_ranges().remove(this);
 }
 
-JS::ThrowCompletionOr<void> Range::initialize(JS::Realm& realm)
+void Range::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::RangePrototype>(realm, "Range"));
-
-    return {};
 }
 
 void Range::visit_edges(Cell::Visitor& visitor)

Userland/Libraries/LibWeb/DOM/Range.h

@@ -95,7 +95,7 @@ private:
     explicit Range(Document&);
     Range(Node& start_container, u32 start_offset, Node& end_container, u32 end_offset);
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
 
     Node& root();

Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp

@@ -19,11 +19,10 @@ ShadowRoot::ShadowRoot(Document& document, Element& host, Bindings::ShadowRootMo
     set_host(&host);
 }
 
-JS::ThrowCompletionOr<void> ShadowRoot::initialize(JS::Realm& realm)
+void ShadowRoot::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::ShadowRootPrototype>(realm, "ShadowRoot"));
-    return {};
 }
 
 // https://dom.spec.whatwg.org/#ref-for-get-the-parent%E2%91%A6

Userland/Libraries/LibWeb/DOM/ShadowRoot.h

@@ -31,7 +31,7 @@ public:
 
 private:
     ShadowRoot(Document&, Element& host, Bindings::ShadowRootMode);
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 
     // ^Node
     virtual DeprecatedFlyString node_name() const override { return "#shadow-root"; }

Userland/Libraries/LibWeb/DOM/StaticRange.cpp

@@ -35,12 +35,10 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<StaticRange>> StaticRange::construct_impl(J
     return MUST_OR_THROW_OOM(realm.heap().allocate<StaticRange>(realm, *init.start_container, init.start_offset, *init.end_container, init.end_offset));
 }
 
-JS::ThrowCompletionOr<void> StaticRange::initialize(JS::Realm& realm)
+void StaticRange::initialize(JS::Realm& realm)
 {
-    MUST_OR_THROW_OOM(Base::initialize(realm));
+    Base::initialize(realm);
     set_prototype(&Bindings::ensure_web_prototype<Bindings::StaticRangePrototype>(realm, "StaticRange"));
-
-    return {};
 }
 
 }

Userland/Libraries/LibWeb/DOM/StaticRange.h

@@ -29,7 +29,7 @@ public:
     StaticRange(Node& start_container, u32 start_offset, Node& end_container, u32 end_offset);
     virtual ~StaticRange() override;
 
-    virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
+    virtual void initialize(JS::Realm&) override;
 };
 
 }