LibWeb: Add the CSSAnimation IDL object

Userland/Libraries/LibWeb/CSS/CSSAnimation.cpp

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+/*
+ * Copyright (c) 2024, Matthew Olsson <mattco@serenityos.org>.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Animations/KeyframeEffect.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/CSS/CSSAnimation.h>
+#include <LibWeb/DOM/Element.h>
+
+namespace Web::CSS {
+
+JS::NonnullGCPtr<CSSAnimation> CSSAnimation::create(JS::Realm& realm)
+{
+    return realm.heap().allocate<CSSAnimation>(realm, realm);
+}
+
+CSSAnimation::CSSAnimation(JS::Realm& realm)
+    : Animations::Animation(realm)
+{
+}
+
+void CSSAnimation::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::CSSAnimationPrototype>(realm, "CSSAnimation"_fly_string));
+}
+
+void CSSAnimation::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_owning_element);
+}
+
+}

Userland/Libraries/LibWeb/CSS/CSSAnimation.h

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+/*
+ * Copyright (c) 2024, Matthew Olsson <mattco@serenityos.org>.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/Animations/Animation.h>
+#include <LibWeb/CSS/PropertyID.h>
+#include <LibWeb/CSS/StyleValue.h>
+
+namespace Web::CSS {
+
+// https://www.w3.org/TR/css-animations-2/#cssanimation
+class CSSAnimation : public Animations::Animation {
+    WEB_PLATFORM_OBJECT(CSSAnimation, Animations::Animation);
+
+public:
+    static JS::NonnullGCPtr<CSSAnimation> create(JS::Realm&);
+
+    JS::GCPtr<DOM::Element> owning_element() const { return m_owning_element; }
+    void set_owning_element(JS::GCPtr<DOM::Element> value) { m_owning_element = value; }
+
+    FlyString const& animation_name() const { return id(); }
+
+private:
+    explicit CSSAnimation(JS::Realm&);
+
+    virtual void initialize(JS::Realm&) override;
+    virtual void visit_edges(Cell::Visitor&) override;
+
+    virtual bool is_css_animation() const override { return true; }
+
+    // https://www.w3.org/TR/css-animations-2/#owning-element-section
+    JS::GCPtr<DOM::Element> m_owning_element;
+};
+
+}

Userland/Libraries/LibWeb/CSS/CSSAnimation.idl

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+#import <Animations/Animation.idl>
+
+// https://www.w3.org/TR/css-animations-2/#cssanimation
+[Exposed=Window]
+interface CSSAnimation : Animation {
+  readonly attribute CSSOMString animationName;
+};