LibWeb: Add the MathML Element

This patch introduces the MathML element, which provides the interface
all MathML elements are built from.

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -450,6 +450,7 @@ set(SOURCES
     Loader/ProxyMappings.cpp
     Loader/Resource.cpp
     Loader/ResourceLoader.cpp
+    MathML/MathMLElement.cpp
     MimeSniff/MimeType.cpp
     Namespace.cpp
     NavigationTiming/EntryNames.cpp

Userland/Libraries/LibWeb/Forward.h

@@ -497,6 +497,10 @@ enum class LayoutMode;
 struct LayoutState;
 }
 
+namespace Web::MathML {
+class MathMLElement;
+}
+
 namespace Web::MimeSniff {
 class MimeType;
 }

Userland/Libraries/LibWeb/MathML/MathMLElement.cpp

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2023, Jonah Shafran <jonahshafran@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/ExceptionOrUtils.h>
+#include <LibWeb/MathML/MathMLElement.h>
+
+namespace Web::MathML {
+
+MathMLElement::~MathMLElement() = default;
+
+MathMLElement::MathMLElement(DOM::Document& document, DOM::QualifiedName qualified_name)
+    : DOM::Element(document, move(qualified_name))
+{
+}
+
+void MathMLElement::initialize(JS::Realm& realm)
+{
+    Base::initialize(realm);
+    set_prototype(&Bindings::ensure_web_prototype<Bindings::MathMLElementPrototype>(realm, "MathMLElement"));
+
+    m_dataset = MUST(HTML::DOMStringMap::create(*this));
+}
+
+}

Userland/Libraries/LibWeb/MathML/MathMLElement.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2023, Jonah Shafran <jonahshafran@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/DOM/Element.h>
+#include <LibWeb/HTML/DOMStringMap.h>
+#include <LibWeb/HTML/GlobalEventHandlers.h>
+
+namespace Web::MathML {
+
+class MathMLElement : public DOM::Element
+    , public HTML::GlobalEventHandlers {
+    WEB_PLATFORM_OBJECT(MathMLElement, Element);
+
+public:
+    virtual ~MathMLElement() override;
+
+    HTML::DOMStringMap* dataset() { return m_dataset.ptr(); }
+    HTML::DOMStringMap const* dataset() const { return m_dataset.ptr(); }
+
+protected:
+    virtual DOM::EventTarget& global_event_handlers_to_event_target(FlyString const&) override { return *this; }
+
+private:
+    MathMLElement(DOM::Document&, DOM::QualifiedName);
+
+    virtual void initialize(JS::Realm&) override;
+
+    JS::GCPtr<HTML::DOMStringMap> m_dataset;
+};
+
+}

Userland/Libraries/LibWeb/MathML/MathMLElement.idl

@@ -0,0 +1,9 @@
+#import <DOM/Element.idl>
+#import <DOM/EventHandler.idl>
+#import <HTML/HTMLElement.idl>
+
+// https://w3c.github.io/mathml-core/#dom-and-javascript
+[Exposed=Window]
+interface MathMLElement : Element { };
+MathMLElement includes GlobalEventHandlers;
+MathMLElement includes HTMLOrSVGElement; // FIXME: We technically use HTMLOrForeignElement which is a rename of HTMLOrSVGElement, when that change is upstreamed we should update here

Userland/Libraries/LibWeb/idl_files.cmake

@@ -187,6 +187,7 @@ libweb_js_bindings(HighResolutionTime/Performance)
 libweb_js_bindings(Internals/Internals)
 libweb_js_bindings(IntersectionObserver/IntersectionObserver)
 libweb_js_bindings(IntersectionObserver/IntersectionObserverEntry)
+libweb_js_bindings(MathML/MathMLElement)
 libweb_js_bindings(NavigationTiming/PerformanceTiming)
 libweb_js_bindings(PerformanceTimeline/PerformanceEntry)
 libweb_js_bindings(RequestIdleCallback/IdleDeadline)