LibWeb: Add Support for the ARIA Element Properties

Element now supports getting and setting ARIA properties from
JS and HTML.

Userland/Libraries/LibWeb/HTML/HTMLSelectElement.h

@@ -60,6 +60,8 @@ public:
 
     DeprecatedString const& type() const;
 
+    virtual FlyString default_role() const override;
+
 private:
     HTMLSelectElement(DOM::Document&, DOM::QualifiedName);