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/HTML/HTMLHeadingElement.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/ARIA/Roles.h>
+#include <LibWeb/HTML/HTMLElement.h>
+
+namespace Web::HTML {
+
+class HTMLHeadingElement final : public HTMLElement {
+    WEB_PLATFORM_OBJECT(HTMLHeadingElement, HTMLElement);
+    JS_DECLARE_ALLOCATOR(HTMLHeadingElement);
+
+public:
+    virtual ~HTMLHeadingElement() override;
+
+    virtual void apply_presentational_hints(CSS::StyleProperties&) const override;
+
+    // https://www.w3.org/TR/html-aria/#el-h1-h6
+    virtual Optional<ARIA::Role> default_role() const override { return ARIA::Role::heading; }
+
+    virtual Optional<String> aria_level() const override
+    {
+        // TODO: aria-level = the number in the element's tag name
+        return get_attribute("aria-level"_fly_string);
+    }
+
+private:
+    HTMLHeadingElement(DOM::Document&, DOM::QualifiedName);
+
+    virtual void initialize(JS::Realm&) override;
+};
+
+}