LibWeb: Add DocumentOrShadowRoot::get_animations()

Author: https://github.com/mattco98
Commit: 5b84bd6e45
Pull-request: https://github.com/SerenityOS/serenity/pull/24530

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -4406,6 +4406,16 @@ void Document::ensure_animation_timer()
     m_animation_driver_timer->start();
 }
 
+Vector<JS::NonnullGCPtr<Animations::Animation>> Document::get_animations()
+{
+    Vector<JS::NonnullGCPtr<Animations::Animation>> relevant_animations;
+    for_each_child_of_type<Element>([&](auto& child) {
+        relevant_animations.extend(child.get_animations({ .subtree = true }));
+        return IterationDecision::Continue;
+    });
+    return relevant_animations;
+}
+
 // https://html.spec.whatwg.org/multipage/dom.html#dom-document-nameditem-filter
 static bool is_potentially_named_element(DOM::Element const& element)
 {

Userland/Libraries/LibWeb/DOM/Document.h

@@ -612,6 +612,8 @@ public:
     void remove_replaced_animations();
     void ensure_animation_timer();
 
+    Vector<JS::NonnullGCPtr<Animations::Animation>> get_animations();
+
     bool ready_to_run_scripts() const { return m_ready_to_run_scripts; }
     void set_ready_to_run_scripts() { m_ready_to_run_scripts = true; }
 

Userland/Libraries/LibWeb/DOM/DocumentOrShadowRoot.idl

@@ -5,4 +5,7 @@ interface mixin DocumentOrShadowRoot {
     // https://w3c.github.io/csswg-drafts/cssom/#extensions-to-the-document-or-shadow-root-interface
     [SameObject, ImplementedAs=style_sheets_for_bindings] readonly attribute StyleSheetList styleSheets;
     attribute any adoptedStyleSheets;
+
+    // https://www.w3.org/TR/web-animations-1/#extensions-to-the-documentorshadowroot-interface-mixin
+    sequence<Animation> getAnimations();
 };

Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp

@@ -130,4 +130,14 @@ void ShadowRoot::for_each_css_style_sheet(Function<void(CSS::CSSStyleSheet&)>&&
     }
 }
 
+Vector<JS::NonnullGCPtr<Animations::Animation>> ShadowRoot::get_animations()
+{
+    Vector<JS::NonnullGCPtr<Animations::Animation>> relevant_animations;
+    for_each_child_of_type<Element>([&](auto& child) {
+        relevant_animations.extend(child.get_animations({ .subtree = true }));
+        return IterationDecision::Continue;
+    });
+    return relevant_animations;
+}
+
 }

Userland/Libraries/LibWeb/DOM/ShadowRoot.h

@@ -47,6 +47,8 @@ public:
 
     void for_each_css_style_sheet(Function<void(CSS::CSSStyleSheet&)>&& callback) const;
 
+    Vector<JS::NonnullGCPtr<Animations::Animation>> get_animations();
+
     virtual void finalize() override;
 
 protected: