LibWeb: Pass old parent's root to Node::removed_from()

This will allow nodes to access the root they've just been removed from.
Author: https://github.com/awesomekling Commit: 7269fc3e52 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3345 Reviewed-by: https://github.com/AtkinsSJ
2025-07-28 19:59:17 +00:00 · 2025-01-23 17:37:18 +01:00 · 2025-01-23 17:37:18 +01:00 · 7269fc3e52 · 2025-01-23 20:40:20 +00:00
commit 7269fc3e52
parent d465e2aa2b
39 changed files with 65 additions and 60 deletions
--- a/Libraries/LibWeb/DOM/Element.cpp
+++ b/Libraries/LibWeb/DOM/Element.cpp
@ -1089,9 +1089,9 @@ void Element::inserted()
        document().element_with_name_was_added({}, *this);
 }

-void Element::removed_from(Node* node)
+void Element::removed_from(Node* old_parent, Node& old_root)
 {
-    Base::removed_from(node);
+    Base::removed_from(old_parent, old_root);

    if (m_id.has_value())
        document().element_with_id_was_removed({}, *this);
--- a/Libraries/LibWeb/DOM/Element.h
+++ b/Libraries/LibWeb/DOM/Element.h
@ -403,7 +403,7 @@ protected:
    virtual void initialize(JS::Realm&) override;

    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void children_changed() override;
    virtual i32 default_tab_index_value() const;

--- a/Libraries/LibWeb/DOM/Node.cpp
+++ b/Libraries/LibWeb/DOM/Node.cpp
@ -906,9 +906,11 @@ void Node::remove(bool suppress_observers)
    if (auto assigned_slot = assigned_slot_for_node(*this))
        assign_slottables(*assigned_slot);

+    auto& parent_root = parent->root();
+
    // 13. If parent’s root is a shadow root, and parent is a slot whose assigned nodes is the empty list, then run
    //     signal a slot change for parent.
-    if (parent->root().is_shadow_root() && is<HTML::HTMLSlotElement>(parent)) {
+    if (parent_root.is_shadow_root() && is<HTML::HTMLSlotElement>(parent)) {
        auto& slot = static_cast<HTML::HTMLSlotElement&>(*parent);

        if (slot.assigned_nodes_internal().is_empty())
@ -925,14 +927,14 @@ void Node::remove(bool suppress_observers)

    if (has_descendent_slot) {
        // 1. Run assign slottables for a tree with parent’s root.
-        assign_slottables_for_a_tree(parent->root());
+        assign_slottables_for_a_tree(parent_root);

        // 2. Run assign slottables for a tree with node.
        assign_slottables_for_a_tree(*this);
    }

    // 15. Run the removing steps with node and parent.
-    removed_from(parent);
+    removed_from(parent, parent_root);

    // 16. Let isParentConnected be parent’s connected.
    bool is_parent_connected = parent->is_connected();
@ -953,7 +955,7 @@ void Node::remove(bool suppress_observers)
    // 18. For each shadow-including descendant descendant of node, in shadow-including tree order, then:
    for_each_shadow_including_descendant([&](Node& descendant) {
        // 1. Run the removing steps with descendant
-        descendant.removed_from(nullptr);
+        descendant.removed_from(nullptr, parent_root);

        // 2. If descendant is custom and isParentConnected is true, then enqueue a custom element callback reaction with descendant,
        //    callback name "disconnectedCallback", and an empty argument list.
@ -1433,7 +1435,7 @@ void Node::inserted()
    set_needs_style_update(true);
 }

-void Node::removed_from(Node*)
+void Node::removed_from(Node*, Node&)
 {
    m_layout_node = nullptr;
    m_paintable = nullptr;
--- a/Libraries/LibWeb/DOM/Node.h
+++ b/Libraries/LibWeb/DOM/Node.h
@ -261,7 +261,7 @@ public:

    virtual void inserted();
    virtual void post_connection();
-    virtual void removed_from(Node*);
+    virtual void removed_from(Node* old_parent, Node& old_root);
    virtual void children_changed() { }
    virtual void adopted_from(Document&) { }
    virtual WebIDL::ExceptionOr<void> cloned(Node&, bool) const { return {}; }
--- a/Libraries/LibWeb/HTML/FormAssociatedElement.h
+++ b/Libraries/LibWeb/HTML/FormAssociatedElement.h
@ -38,11 +38,11 @@ private:
        form_associated_element_was_inserted();                                                                                                                             \
    }                                                                                                                                                                       \
                                                                                                                                                                            \
-    virtual void removed_from(DOM::Node* node) override                                                                                                                     \
+    virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override                                                                                          \
    {                                                                                                                                                                       \
-        ElementBaseClass::removed_from(node);                                                                                                                               \
+        ElementBaseClass::removed_from(old_parent, old_root);                                                                                                               \
        form_node_was_removed();                                                                                                                                            \
-        form_associated_element_was_removed(node);                                                                                                                          \
+        form_associated_element_was_removed(old_parent);                                                                                                                    \
    }                                                                                                                                                                       \
                                                                                                                                                                            \
    virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override \
--- a/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLBaseElement.cpp
@ -40,9 +40,9 @@ void HTMLBaseElement::inserted()
        set_the_frozen_base_url();
 }

-void HTMLBaseElement::removed_from(Node* parent)
+void HTMLBaseElement::removed_from(Node* old_parent, Node& old_root)
 {
-    HTMLElement::removed_from(parent);
+    HTMLElement::removed_from(old_parent, old_root);
    document().update_base_element({});
 }

--- a/Libraries/LibWeb/HTML/HTMLBaseElement.h
+++ b/Libraries/LibWeb/HTML/HTMLBaseElement.h
@ -23,7 +23,7 @@ public:
    URL::URL const& frozen_base_url() const { return m_frozen_base_url; }

    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;

 private:
--- a/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLDetailsElement.cpp
@ -52,8 +52,9 @@ void HTMLDetailsElement::inserted()
    update_shadow_tree_slots();
 }

-void HTMLDetailsElement::removed_from(DOM::Node*)
+void HTMLDetailsElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
+    Base::removed_from(old_parent, old_root);
    set_shadow_root(nullptr);
 }

--- a/Libraries/LibWeb/HTML/HTMLDetailsElement.h
+++ b/Libraries/LibWeb/HTML/HTMLDetailsElement.h
@ -32,7 +32,7 @@ private:
    virtual void visit_edges(Cell::Visitor&) override;

    virtual void inserted() override;
-    virtual void removed_from(DOM::Node*) override;
+    virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override;
    virtual void children_changed() override;
    virtual void attribute_changed(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;

--- a/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLDialogElement.cpp
@ -41,9 +41,9 @@ void HTMLDialogElement::visit_edges(JS::Cell::Visitor& visitor)
    visitor.visit(m_close_watcher);
 }

-void HTMLDialogElement::removed_from(Node* old_parent)
+void HTMLDialogElement::removed_from(Node* old_parent, Node& old_root)
 {
-    HTMLElement::removed_from(old_parent);
+    HTMLElement::removed_from(old_parent, old_root);

    // 1. If removedNode's close watcher is not null, then:
    if (m_close_watcher) {
--- a/Libraries/LibWeb/HTML/HTMLDialogElement.h
+++ b/Libraries/LibWeb/HTML/HTMLDialogElement.h
@ -20,7 +20,7 @@ class HTMLDialogElement final : public HTMLElement {
 public:
    virtual ~HTMLDialogElement() override;

-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;

    String return_value() const;
    void set_return_value(String);
--- a/Libraries/LibWeb/HTML/HTMLElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLElement.cpp
@ -1286,9 +1286,9 @@ void HTMLElement::did_lose_focus()
    document().editing_host_manager()->set_active_contenteditable_element(nullptr);
 }

-void HTMLElement::removed_from(Node* old_parent)
+void HTMLElement::removed_from(Node* old_parent, Node& old_root)
 {
-    Element::removed_from(old_parent);
+    Element::removed_from(old_parent, old_root);

    // If removedNode's popover attribute is not in the no popover state, then run the hide popover algorithm given removedNode, false, false, and false.
    if (popover().has_value())
--- a/Libraries/LibWeb/HTML/HTMLElement.h
+++ b/Libraries/LibWeb/HTML/HTMLElement.h
@ -116,7 +116,7 @@ public:
    WebIDL::ExceptionOr<void> set_popover(Optional<String> value);
    Optional<String> popover() const;

-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;

    enum class PopoverVisibilityState {
        Hidden,
--- a/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLFrameElement.cpp
@ -56,9 +56,9 @@ void HTMLFrameElement::inserted()
 }

 // https://html.spec.whatwg.org/multipage/obsolete.html#frames:html-element-removing-steps
-void HTMLFrameElement::removed_from(DOM::Node* node)
+void HTMLFrameElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
-    Base::removed_from(node);
+    Base::removed_from(old_parent, old_root);

    // The frame HTML element removing steps, given removedNode, are to destroy a child navigable given removedNode.
    destroy_the_child_navigable();
--- a/Libraries/LibWeb/HTML/HTMLFrameElement.h
+++ b/Libraries/LibWeb/HTML/HTMLFrameElement.h
@ -25,7 +25,7 @@ private:

    // ^DOM::Element
    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
    virtual i32 default_tab_index_value() const override;
    virtual void adjust_computed_style(CSS::ComputedProperties&) override;
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.cpp
@ -173,9 +173,9 @@ void HTMLIFrameElement::process_the_iframe_attributes(bool initial_insertion)
 }

 // https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-iframe-element:the-iframe-element-7
-void HTMLIFrameElement::removed_from(DOM::Node* node)
+void HTMLIFrameElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
-    HTMLElement::removed_from(node);
+    HTMLElement::removed_from(old_parent, old_root);

    // When an iframe element is removed from a document, the user agent must destroy the nested navigable of the element.
    destroy_the_child_navigable();
--- a/Libraries/LibWeb/HTML/HTMLIFrameElement.h
+++ b/Libraries/LibWeb/HTML/HTMLIFrameElement.h
@ -45,7 +45,7 @@ private:

    // ^DOM::Element
    virtual void post_connection() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
    virtual i32 default_tab_index_value() const override;

--- a/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
@ -50,9 +50,9 @@ void HTMLLinkElement::initialize(JS::Realm& realm)
    WEB_SET_PROTOTYPE_FOR_INTERFACE(HTMLLinkElement);
 }

-void HTMLLinkElement::removed_from(Node* old_parent)
+void HTMLLinkElement::removed_from(Node* old_parent, Node& old_root)
 {
-    Base::removed_from(old_parent);
+    Base::removed_from(old_parent, old_root);
    if (m_loaded_style_sheet) {
        document_or_shadow_root_style_sheets().remove_a_css_style_sheet(*m_loaded_style_sheet);
        m_loaded_style_sheet = nullptr;
--- a/Libraries/LibWeb/HTML/HTMLLinkElement.h
+++ b/Libraries/LibWeb/HTML/HTMLLinkElement.h
@ -28,7 +28,7 @@ public:
    virtual ~HTMLLinkElement() override;

    virtual void inserted() override;
-    virtual void removed_from(Node* old_parent) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;

    String rel() const { return get_attribute_value(HTML::AttributeNames::rel); }
    String type() const { return get_attribute_value(HTML::AttributeNames::type); }
--- a/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
@ -112,9 +112,9 @@ void HTMLMediaElement::attribute_changed(FlyString const& name, Optional<String>
 }

 // https://html.spec.whatwg.org/multipage/media.html#playing-the-media-resource:media-element-83
-void HTMLMediaElement::removed_from(DOM::Node* node)
+void HTMLMediaElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
-    Base::removed_from(node);
+    Base::removed_from(old_parent, old_root);

    // When a media element is removed from a Document, the user agent must run the following steps:

--- a/Libraries/LibWeb/HTML/HTMLMediaElement.h
+++ b/Libraries/LibWeb/HTML/HTMLMediaElement.h
@ -157,7 +157,7 @@ protected:
    virtual void visit_edges(Cell::Visitor&) override;

    virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
-    virtual void removed_from(DOM::Node*) override;
+    virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override;
    virtual void children_changed() override;

    // Override in subclasses to handle implementation-specific behavior when the element state changes
--- a/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLMetaElement.cpp
@ -151,9 +151,9 @@ void HTMLMetaElement::inserted()
    }
 }

-void HTMLMetaElement::removed_from(Node* parent)
+void HTMLMetaElement::removed_from(Node* old_parent, Node& old_root)
 {
-    Base::removed_from(parent);
+    Base::removed_from(old_parent, old_root);
    update_metadata();
 }

--- a/Libraries/LibWeb/HTML/HTMLMetaElement.h
+++ b/Libraries/LibWeb/HTML/HTMLMetaElement.h
@ -45,7 +45,7 @@ private:

    // ^DOM::Element
    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void attribute_changed(FlyString const& local_name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;
 };

--- a/Libraries/LibWeb/HTML/HTMLMeterElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLMeterElement.cpp
@ -173,8 +173,9 @@ void HTMLMeterElement::inserted()
    create_shadow_tree_if_needed();
 }

-void HTMLMeterElement::removed_from(DOM::Node*)
+void HTMLMeterElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
+    Base::removed_from(old_parent, old_root);
    set_shadow_root(nullptr);
 }

--- a/Libraries/LibWeb/HTML/HTMLMeterElement.h
+++ b/Libraries/LibWeb/HTML/HTMLMeterElement.h
@ -35,7 +35,7 @@ public:

    // ^HTMLElement
    virtual void inserted() override;
-    virtual void removed_from(DOM::Node*) override;
+    virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override;

    virtual void adjust_computed_style(CSS::ComputedProperties&) override;

--- a/Libraries/LibWeb/HTML/HTMLOptGroupElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLOptGroupElement.cpp
@ -36,9 +36,9 @@ void HTMLOptGroupElement::inserted()
        static_cast<HTMLSelectElement&>(*parent()).update_selectedness();
 }

-void HTMLOptGroupElement::removed_from(Node* old_parent)
+void HTMLOptGroupElement::removed_from(Node* old_parent, Node& old_root)
 {
-    Base::removed_from(old_parent);
+    Base::removed_from(old_parent, old_root);

    // The optgroup HTML element removing steps, given removedNode and oldParent, are:
    // 1. If oldParent is a select element and removedNode has an option child, then run oldParent's selectedness setting algorithm.
--- a/Libraries/LibWeb/HTML/HTMLOptGroupElement.h
+++ b/Libraries/LibWeb/HTML/HTMLOptGroupElement.h
@ -25,7 +25,7 @@ private:
    HTMLOptGroupElement(DOM::Document&, DOM::QualifiedName);

    virtual void initialize(JS::Realm&) override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void inserted() override;
 };

--- a/Libraries/LibWeb/HTML/HTMLOptionElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLOptionElement.cpp
@ -232,9 +232,9 @@ void HTMLOptionElement::inserted()
        static_cast<HTMLSelectElement&>(*parent()->parent()).update_selectedness();
 }

-void HTMLOptionElement::removed_from(Node* old_parent)
+void HTMLOptionElement::removed_from(Node* old_parent, Node& old_root)
 {
-    Base::removed_from(old_parent);
+    Base::removed_from(old_parent, old_root);

    // The option HTML element removing steps, given removedNode and oldParent, are:
    // 1. If oldParent is a select element, or oldParent is an optgroup element whose parent is a select element,
--- a/Libraries/LibWeb/HTML/HTMLOptionElement.h
+++ b/Libraries/LibWeb/HTML/HTMLOptionElement.h
@ -51,7 +51,7 @@ private:
    virtual void attribute_changed(FlyString const& name, Optional<String> const& old_value, Optional<String> const& value, Optional<FlyString> const& namespace_) override;

    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;
    virtual void children_changed() override;

    void ask_for_a_reset();
--- a/Libraries/LibWeb/HTML/HTMLProgressElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLProgressElement.cpp
@ -95,8 +95,9 @@ void HTMLProgressElement::inserted()
    create_shadow_tree_if_needed();
 }

-void HTMLProgressElement::removed_from(DOM::Node*)
+void HTMLProgressElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
+    Base::removed_from(old_parent, old_root);
    set_shadow_root(nullptr);
 }

--- a/Libraries/LibWeb/HTML/HTMLProgressElement.h
+++ b/Libraries/LibWeb/HTML/HTMLProgressElement.h
@ -29,7 +29,7 @@ public:

    // ^HTMLElement
    virtual void inserted() override;
-    virtual void removed_from(DOM::Node*) override;
+    virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override;

    virtual void adjust_computed_style(CSS::ComputedProperties&) override;

--- a/Libraries/LibWeb/HTML/HTMLSourceElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLSourceElement.cpp
@ -47,10 +47,10 @@ void HTMLSourceElement::inserted()
 }

 // https://html.spec.whatwg.org/multipage/embedded-content.html#the-source-element:the-source-element-16
-void HTMLSourceElement::removed_from(DOM::Node* old_parent)
+void HTMLSourceElement::removed_from(DOM::Node* old_parent, DOM::Node& old_root)
 {
    // The source HTML element removing steps, given removedNode and oldParent, are:
-    Base::removed_from(old_parent);
+    Base::removed_from(old_parent, old_root);

    // FIXME: 1. If removedNode's next sibling was an img element and oldParent is a picture element, then, count this as a
    //           relevant mutation for the img element.
--- a/Libraries/LibWeb/HTML/HTMLSourceElement.h
+++ b/Libraries/LibWeb/HTML/HTMLSourceElement.h
@ -23,7 +23,7 @@ private:
    virtual void initialize(JS::Realm&) override;

    virtual void inserted() override;
-    virtual void removed_from(DOM::Node*) override;
+    virtual void removed_from(DOM::Node* old_parent, DOM::Node& old_root) override;
 };

 }
--- a/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLStyleElement.cpp
@ -44,10 +44,10 @@ void HTMLStyleElement::inserted()
    Base::inserted();
 }

-void HTMLStyleElement::removed_from(Node* old_parent)
+void HTMLStyleElement::removed_from(Node* old_parent, Node& old_root)
 {
    m_style_element_utils.update_a_style_block(*this);
-    Base::removed_from(old_parent);
+    Base::removed_from(old_parent, old_root);
 }

 // https://html.spec.whatwg.org/multipage/semantics.html#dom-style-disabled
--- a/Libraries/LibWeb/HTML/HTMLStyleElement.h
+++ b/Libraries/LibWeb/HTML/HTMLStyleElement.h
@ -21,7 +21,7 @@ public:

    virtual void children_changed() override;
    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;

    bool disabled();
    void set_disabled(bool disabled);
--- a/Libraries/LibWeb/SVG/SVGElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGElement.cpp
@ -128,9 +128,9 @@ void SVGElement::update_use_elements_that_reference_this()
    });
 }

-void SVGElement::removed_from(Node* parent)
+void SVGElement::removed_from(Node* old_parent, Node& old_root)
 {
-    Base::removed_from(parent);
+    Base::removed_from(old_parent, old_root);

    remove_from_use_element_that_reference_this();
 }
--- a/Libraries/LibWeb/SVG/SVGElement.h
+++ b/Libraries/LibWeb/SVG/SVGElement.h
@ -38,7 +38,7 @@ protected:
    virtual WebIDL::ExceptionOr<void> cloned(DOM::Node&, bool) const override;
    virtual void children_changed() override;
    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;

    void update_use_elements_that_reference_this();
    void remove_from_use_element_that_reference_this();
--- a/Libraries/LibWeb/SVG/SVGStyleElement.cpp
+++ b/Libraries/LibWeb/SVG/SVGStyleElement.cpp
@ -42,10 +42,10 @@ void SVGStyleElement::inserted()
    Base::inserted();
 }

-void SVGStyleElement::removed_from(Node* old_parent)
+void SVGStyleElement::removed_from(Node* old_parent, Node& old_root)
 {
    m_style_element_utils.update_a_style_block(*this);
-    Base::removed_from(old_parent);
+    Base::removed_from(old_parent, old_root);
 }

 // https://www.w3.org/TR/cssom/#dom-linkstyle-sheet
--- a/Libraries/LibWeb/SVG/SVGStyleElement.h
+++ b/Libraries/LibWeb/SVG/SVGStyleElement.h
@ -20,7 +20,7 @@ public:

    virtual void children_changed() override;
    virtual void inserted() override;
-    virtual void removed_from(Node*) override;
+    virtual void removed_from(Node* old_parent, Node& old_root) override;

    CSS::CSSStyleSheet* sheet();
    CSS::CSSStyleSheet const* sheet() const;