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/HTMLLegendElement.cpp

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/HTMLLegendElementPrototype.h>
+#include <LibWeb/Bindings/Intrinsics.h>
+#include <LibWeb/HTML/HTMLFieldSetElement.h>
+#include <LibWeb/HTML/HTMLLegendElement.h>
+
+namespace Web::HTML {
+
+JS_DEFINE_ALLOCATOR(HTMLLegendElement);
+
+HTMLLegendElement::HTMLLegendElement(DOM::Document& document, DOM::QualifiedName qualified_name)
+    : HTMLElement(document, move(qualified_name))
+{
+}
+
+HTMLLegendElement::~HTMLLegendElement() = default;
+
+void HTMLLegendElement::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    WEB_SET_PROTOTYPE_FOR_INTERFACE(HTMLLegendElement);
+}
+
+// https://html.spec.whatwg.org/multipage/form-elements.html#dom-legend-form
+HTMLFormElement* HTMLLegendElement::form()
+{
+    // The form IDL attribute's behavior depends on whether the legend element is in a fieldset element or not.
+    // If the legend has a fieldset element as its parent, then the form IDL attribute must return the same value as the form IDL attribute on that fieldset element.
+    if (is<HTML::HTMLFieldSetElement>(parent_element())) {
+        return verify_cast<HTML::HTMLFieldSetElement>(parent_element())->form();
+    }
+
+    // Otherwise, it must return null.
+    return nullptr;
+}
+
+}