diff --git a/Userland/Libraries/LibWeb/Forward.h b/Userland/Libraries/LibWeb/Forward.h
index aa85a14291..9a61726477 100644
--- a/Userland/Libraries/LibWeb/Forward.h
+++ b/Userland/Libraries/LibWeb/Forward.h
@@ -473,8 +473,6 @@ class ResizeObserverWrapper;
 class SelectionWrapper;
 class StorageWrapper;
 class SubtleCryptoWrapper;
-class SVGAnimatedLengthWrapper;
-class SVGLengthWrapper;
 class TextDecoderWrapper;
 class TextEncoderWrapper;
 class TextMetricsWrapper;
diff --git a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp
index cca546d9d3..87ac513cb4 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.cpp
@@ -4,21 +4,35 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibWeb/Bindings/SVGAnimatedLengthPrototype.h>
+#include <LibWeb/HTML/Window.h>
 #include <LibWeb/SVG/SVGAnimatedLength.h>
 
 namespace Web::SVG {
 
-NonnullRefPtr<SVGAnimatedLength> SVGAnimatedLength::create(NonnullRefPtr<SVGLength> base_val, NonnullRefPtr<SVGLength> anim_val)
+JS::NonnullGCPtr<SVGAnimatedLength> SVGAnimatedLength::create(HTML::Window& window, JS::NonnullGCPtr<SVGLength> base_val, JS::NonnullGCPtr<SVGLength> anim_val)
 {
-    return adopt_ref(*new SVGAnimatedLength(move(base_val), move(anim_val)));
+    return *window.heap().allocate<SVGAnimatedLength>(window.realm(), window, move(base_val), move(anim_val));
 }
 
-SVGAnimatedLength::SVGAnimatedLength(NonnullRefPtr<SVGLength> base_val, NonnullRefPtr<SVGLength> anim_val)
-    : m_base_val(move(base_val))
+SVGAnimatedLength::SVGAnimatedLength(HTML::Window& window, JS::NonnullGCPtr<SVGLength> base_val, JS::NonnullGCPtr<SVGLength> anim_val)
+    : PlatformObject(window.realm())
+    , m_base_val(move(base_val))
     , m_anim_val(move(anim_val))
 {
+    set_prototype(&window.ensure_web_prototype<Bindings::SVGAnimatedLengthPrototype>("SVGAnimatedLength"));
+
     // The object referenced by animVal will always be distinct from the one referenced by baseVal, even when the attribute is not animated.
     VERIFY(m_base_val.ptr() != m_anim_val.ptr());
 }
 
+SVGAnimatedLength::~SVGAnimatedLength() = default;
+
+void SVGAnimatedLength::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_base_val.ptr());
+    visitor.visit(m_anim_val.ptr());
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h
index 72c338cfed..2d92ef6f96 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGAnimatedLength.h
@@ -6,32 +6,31 @@
 
 #pragma once
 
-#include <AK/RefCounted.h>
-#include <AK/Weakable.h>
-#include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/Bindings/PlatformObject.h>
 #include <LibWeb/SVG/SVGLength.h>
 
 namespace Web::SVG {
 
 // https://www.w3.org/TR/SVG11/types.html#InterfaceSVGAnimatedLength
-class SVGAnimatedLength
-    : public RefCounted<SVGAnimatedLength>
-    , public Bindings::Wrappable
-    , public Weakable<SVGAnimatedLength> {
+class SVGAnimatedLength final : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(SVGAnimatedLength, Bindings::PlatformObject);
+
 public:
-    using WrapperType = Bindings::SVGAnimatedLengthWrapper;
+    static JS::NonnullGCPtr<SVGAnimatedLength> create(HTML::Window&, JS::NonnullGCPtr<SVGLength> base_val, JS::NonnullGCPtr<SVGLength> anim_val);
+    virtual ~SVGAnimatedLength() override;
 
-    static NonnullRefPtr<SVGAnimatedLength> create(NonnullRefPtr<SVGLength> base_val, NonnullRefPtr<SVGLength> anim_val);
-    virtual ~SVGAnimatedLength() = default;
-
-    NonnullRefPtr<SVGLength> const& base_val() const { return m_base_val; }
-    NonnullRefPtr<SVGLength> const& anim_val() const { return m_anim_val; }
+    JS::NonnullGCPtr<SVGLength> base_val() const { return m_base_val; }
+    JS::NonnullGCPtr<SVGLength> anim_val() const { return m_anim_val; }
 
 private:
-    SVGAnimatedLength(NonnullRefPtr<SVGLength> base_val, NonnullRefPtr<SVGLength> anim_val);
+    SVGAnimatedLength(HTML::Window&, JS::NonnullGCPtr<SVGLength> base_val, JS::NonnullGCPtr<SVGLength> anim_val);
 
-    NonnullRefPtr<SVGLength> m_base_val;
-    NonnullRefPtr<SVGLength> m_anim_val;
+    virtual void visit_edges(Cell::Visitor&) override;
+
+    JS::NonnullGCPtr<SVGLength> m_base_val;
+    JS::NonnullGCPtr<SVGLength> m_anim_val;
 };
 
 }
+
+WRAPPER_HACK(SVGAnimatedLength, Web::SVG)
diff --git a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp
index b2c1af6143..b77779a53b 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.cpp
@@ -74,33 +74,33 @@ Gfx::Path& SVGCircleElement::get_path()
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#CircleElementCXAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGCircleElement::cx() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGCircleElement::cx() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_center_x.value_or(0));
-    auto anim_length = SVGLength::create(0, m_center_x.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_center_x.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_center_x.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#CircleElementCYAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGCircleElement::cy() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGCircleElement::cy() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_center_y.value_or(0));
-    auto anim_length = SVGLength::create(0, m_center_y.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_center_y.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_center_y.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#CircleElementRAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGCircleElement::r() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGCircleElement::r() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_radius.value_or(0));
-    auto anim_length = SVGLength::create(0, m_radius.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_radius.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_radius.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h
index 4d8a940118..c5a0e4cc74 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGCircleElement.h
@@ -21,9 +21,9 @@ public:
 
     virtual Gfx::Path& get_path() override;
 
-    NonnullRefPtr<SVGAnimatedLength> cx() const;
-    NonnullRefPtr<SVGAnimatedLength> cy() const;
-    NonnullRefPtr<SVGAnimatedLength> r() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> cx() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> cy() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> r() const;
 
 private:
     SVGCircleElement(DOM::Document&, DOM::QualifiedName);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp
index 2a906800e9..dc9bbd2b2f 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.cpp
@@ -79,43 +79,43 @@ Gfx::Path& SVGEllipseElement::get_path()
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#EllipseElementCXAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGEllipseElement::cx() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGEllipseElement::cx() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_center_x.value_or(0));
-    auto anim_length = SVGLength::create(0, m_center_x.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_center_x.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_center_x.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#EllipseElementCYAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGEllipseElement::cy() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGEllipseElement::cy() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_center_y.value_or(0));
-    auto anim_length = SVGLength::create(0, m_center_y.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_center_y.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_center_y.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#EllipseElementRXAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGEllipseElement::rx() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGEllipseElement::rx() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_radius_x.value_or(0));
-    auto anim_length = SVGLength::create(0, m_radius_x.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_radius_x.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_radius_x.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#EllipseElementRYAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGEllipseElement::ry() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGEllipseElement::ry() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_radius_y.value_or(0));
-    auto anim_length = SVGLength::create(0, m_radius_y.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_radius_y.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_radius_y.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h
index af6fbf6eae..1495fe2f4a 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGEllipseElement.h
@@ -21,10 +21,10 @@ public:
 
     virtual Gfx::Path& get_path() override;
 
-    NonnullRefPtr<SVGAnimatedLength> cx() const;
-    NonnullRefPtr<SVGAnimatedLength> cy() const;
-    NonnullRefPtr<SVGAnimatedLength> rx() const;
-    NonnullRefPtr<SVGAnimatedLength> ry() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> cx() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> cy() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> rx() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> ry() const;
 
 private:
     SVGEllipseElement(DOM::Document&, DOM::QualifiedName);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLength.cpp b/Userland/Libraries/LibWeb/SVG/SVGLength.cpp
index 11c3865479..912feee65b 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLength.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGLength.cpp
@@ -4,21 +4,27 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibWeb/Bindings/SVGLengthPrototype.h>
+#include <LibWeb/HTML/Window.h>
 #include <LibWeb/SVG/SVGLength.h>
 
 namespace Web::SVG {
 
-NonnullRefPtr<SVGLength> SVGLength::create(u8 unit_type, float value)
+JS::NonnullGCPtr<SVGLength> SVGLength::create(HTML::Window& window, u8 unit_type, float value)
 {
-    return adopt_ref(*new SVGLength(unit_type, value));
+    return *window.heap().allocate<SVGLength>(window.realm(), window, unit_type, value);
 }
 
-SVGLength::SVGLength(u8 unit_type, float value)
-    : m_unit_type(unit_type)
+SVGLength::SVGLength(HTML::Window& window, u8 unit_type, float value)
+    : PlatformObject(window.realm())
+    , m_unit_type(unit_type)
     , m_value(value)
 {
+    set_prototype(&window.ensure_web_prototype<Bindings::SVGLengthPrototype>("SVGLength"));
 }
 
+SVGLength::~SVGLength() = default;
+
 // https://www.w3.org/TR/SVG11/types.html#__svg__SVGLength__value
 DOM::ExceptionOr<void> SVGLength::set_value(float value)
 {
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLength.h b/Userland/Libraries/LibWeb/SVG/SVGLength.h
index 9e838775eb..6532f6a05a 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLength.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGLength.h
@@ -6,24 +6,18 @@
 
 #pragma once
 
-#include <AK/RefCounted.h>
-#include <AK/Types.h>
-#include <AK/Weakable.h>
-#include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/Bindings/PlatformObject.h>
 #include <LibWeb/DOM/ExceptionOr.h>
 
 namespace Web::SVG {
 
 // https://www.w3.org/TR/SVG11/types.html#InterfaceSVGLength
-class SVGLength
-    : public RefCounted<SVGLength>
-    , public Bindings::Wrappable
-    , public Weakable<SVGLength> {
-public:
-    using WrapperType = Bindings::SVGLengthWrapper;
+class SVGLength : public Bindings::PlatformObject {
+    WEB_PLATFORM_OBJECT(SVGLength, Bindings::PlatformObject);
 
-    static NonnullRefPtr<SVGLength> create(u8 unit_type, float value);
-    virtual ~SVGLength() = default;
+public:
+    static JS::NonnullGCPtr<SVGLength> create(HTML::Window&, u8 unit_type, float value);
+    virtual ~SVGLength() override;
 
     u8 unit_type() const { return m_unit_type; }
 
@@ -31,10 +25,12 @@ public:
     DOM::ExceptionOr<void> set_value(float value);
 
 private:
-    SVGLength(u8 unit_type, float value);
+    SVGLength(HTML::Window&, u8 unit_type, float value);
 
     u8 m_unit_type { 0 };
     float m_value { 0 };
 };
 
 }
+
+WRAPPER_HACK(SVGLength, Web::SVG)
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp
index 3a78b4a006..c02ce0f6b9 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGLineElement.cpp
@@ -59,43 +59,43 @@ Gfx::Path& SVGLineElement::get_path()
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#LineElementX1Attribute
-NonnullRefPtr<SVGAnimatedLength> SVGLineElement::x1() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGLineElement::x1() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_x1.value_or(0));
-    auto anim_length = SVGLength::create(0, m_x1.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_x1.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_x1.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#LineElementY1Attribute
-NonnullRefPtr<SVGAnimatedLength> SVGLineElement::y1() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGLineElement::y1() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_y1.value_or(0));
-    auto anim_length = SVGLength::create(0, m_y1.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_y1.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_y1.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#LineElementX2Attribute
-NonnullRefPtr<SVGAnimatedLength> SVGLineElement::x2() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGLineElement::x2() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_x2.value_or(0));
-    auto anim_length = SVGLength::create(0, m_x2.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_x2.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_x2.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#LineElementY2Attribute
-NonnullRefPtr<SVGAnimatedLength> SVGLineElement::y2() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGLineElement::y2() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_y2.value_or(0));
-    auto anim_length = SVGLength::create(0, m_y2.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_y2.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_y2.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/SVG/SVGLineElement.h b/Userland/Libraries/LibWeb/SVG/SVGLineElement.h
index cf87b85c05..f4ebe20e6b 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGLineElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGLineElement.h
@@ -21,10 +21,10 @@ public:
 
     virtual Gfx::Path& get_path() override;
 
-    NonnullRefPtr<SVGAnimatedLength> x1() const;
-    NonnullRefPtr<SVGAnimatedLength> y1() const;
-    NonnullRefPtr<SVGAnimatedLength> x2() const;
-    NonnullRefPtr<SVGAnimatedLength> y2() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> x1() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> y1() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> x2() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> y2() const;
 
 private:
     SVGLineElement(DOM::Document&, DOM::QualifiedName);
diff --git a/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp b/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp
index 7dfe0757aa..357dd57809 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp
+++ b/Userland/Libraries/LibWeb/SVG/SVGRectElement.cpp
@@ -156,63 +156,63 @@ Gfx::FloatPoint SVGRectElement::calculate_used_corner_radius_values()
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#RectElementXAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGRectElement::x() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGRectElement::x() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_x.value_or(0));
-    auto anim_length = SVGLength::create(0, m_x.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_x.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_x.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#RectElementYAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGRectElement::y() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGRectElement::y() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_y.value_or(0));
-    auto anim_length = SVGLength::create(0, m_y.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_y.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_y.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#RectElementWidthAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGRectElement::width() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGRectElement::width() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_width.value_or(0));
-    auto anim_length = SVGLength::create(0, m_width.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_width.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_width.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#RectElementHeightAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGRectElement::height() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGRectElement::height() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_height.value_or(0));
-    auto anim_length = SVGLength::create(0, m_height.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_height.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_height.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#RectElementRXAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGRectElement::rx() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGRectElement::rx() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_radius_x.value_or(0));
-    auto anim_length = SVGLength::create(0, m_radius_x.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_radius_x.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_radius_x.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 // https://www.w3.org/TR/SVG11/shapes.html#RectElementRYAttribute
-NonnullRefPtr<SVGAnimatedLength> SVGRectElement::ry() const
+JS::NonnullGCPtr<SVGAnimatedLength> SVGRectElement::ry() const
 {
     // FIXME: Populate the unit type when it is parsed (0 here is "unknown").
     // FIXME: Create a proper animated value when animations are supported.
-    auto base_length = SVGLength::create(0, m_radius_y.value_or(0));
-    auto anim_length = SVGLength::create(0, m_radius_y.value_or(0));
-    return SVGAnimatedLength::create(move(base_length), move(anim_length));
+    auto base_length = SVGLength::create(window(), 0, m_radius_y.value_or(0));
+    auto anim_length = SVGLength::create(window(), 0, m_radius_y.value_or(0));
+    return SVGAnimatedLength::create(window(), move(base_length), move(anim_length));
 }
 
 }
diff --git a/Userland/Libraries/LibWeb/SVG/SVGRectElement.h b/Userland/Libraries/LibWeb/SVG/SVGRectElement.h
index 9e647accf7..b80e539db4 100644
--- a/Userland/Libraries/LibWeb/SVG/SVGRectElement.h
+++ b/Userland/Libraries/LibWeb/SVG/SVGRectElement.h
@@ -21,12 +21,12 @@ public:
 
     virtual Gfx::Path& get_path() override;
 
-    NonnullRefPtr<SVGAnimatedLength> x() const;
-    NonnullRefPtr<SVGAnimatedLength> y() const;
-    NonnullRefPtr<SVGAnimatedLength> width() const;
-    NonnullRefPtr<SVGAnimatedLength> height() const;
-    NonnullRefPtr<SVGAnimatedLength> rx() const;
-    NonnullRefPtr<SVGAnimatedLength> ry() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> x() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> y() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> width() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> height() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> rx() const;
+    JS::NonnullGCPtr<SVGAnimatedLength> ry() const;
 
 private:
     SVGRectElement(DOM::Document&, DOM::QualifiedName);
diff --git a/Userland/Libraries/LibWeb/idl_files.cmake b/Userland/Libraries/LibWeb/idl_files.cmake
index b7472ef6ec..b740482ded 100644
--- a/Userland/Libraries/LibWeb/idl_files.cmake
+++ b/Userland/Libraries/LibWeb/idl_files.cmake
@@ -159,7 +159,7 @@ libweb_js_wrapper(IntersectionObserver/IntersectionObserver)
 libweb_js_wrapper(NavigationTiming/PerformanceTiming NO_INSTANCE)
 libweb_js_wrapper(RequestIdleCallback/IdleDeadline)
 libweb_js_wrapper(ResizeObserver/ResizeObserver)
-libweb_js_wrapper(SVG/SVGAnimatedLength)
+libweb_js_wrapper(SVG/SVGAnimatedLength NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGClipPathElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGDefsElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGElement NO_INSTANCE)
@@ -167,7 +167,7 @@ libweb_js_wrapper(SVG/SVGGeometryElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGGraphicsElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGCircleElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGEllipseElement NO_INSTANCE)
-libweb_js_wrapper(SVG/SVGLength)
+libweb_js_wrapper(SVG/SVGLength NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGLineElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGPathElement NO_INSTANCE)
 libweb_js_wrapper(SVG/SVGPolygonElement NO_INSTANCE)