Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibWeb/CSS/CSSNestedDeclarations.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/CSS/CSSRule.h>
+
+namespace Web::CSS {
+
+class CSSNestedDeclarations final : public CSSRule {
+    WEB_PLATFORM_OBJECT(CSSNestedDeclarations, CSSRule);
+    JS_DECLARE_ALLOCATOR(CSSNestedDeclarations);
+
+public:
+    [[nodiscard]] static JS::NonnullGCPtr<CSSNestedDeclarations> create(JS::Realm&, PropertyOwningCSSStyleDeclaration&);
+
+    virtual ~CSSNestedDeclarations() override = default;
+
+    PropertyOwningCSSStyleDeclaration const& declaration() const { return m_declaration; }
+
+    CSSStyleDeclaration* style();
+
+    CSSStyleRule const& parent_style_rule() const;
+
+private:
+    CSSNestedDeclarations(JS::Realm&, PropertyOwningCSSStyleDeclaration&);
+
+    virtual void initialize(JS::Realm&) override;
+    virtual void visit_edges(Cell::Visitor&) override;
+    virtual String serialized() const override;
+    virtual void clear_caches() override;
+
+    JS::NonnullGCPtr<PropertyOwningCSSStyleDeclaration> m_declaration;
+    JS::GCPtr<CSSStyleRule const> mutable m_parent_style_rule;
+};
+
+template<>
+inline bool CSSRule::fast_is<CSSNestedDeclarations>() const { return type() == CSSRule::Type::NestedDeclarations; }
+
+}