LibWeb: Add Support for the ARIA Element Properties

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

Userland/Libraries/LibWeb/HTML/HTMLSpanElement.h

@@ -6,6 +6,7 @@
 
 #pragma once
 
+#include <LibWeb/DOM/ARIARoleNames.h>
 #include <LibWeb/HTML/HTMLElement.h>
 
 namespace Web::HTML {
@@ -16,6 +17,9 @@ class HTMLSpanElement final : public HTMLElement {
 public:
     virtual ~HTMLSpanElement() override;
 
+    // https://www.w3.org/TR/html-aria/#el-span
+    virtual FlyString default_role() const override { return DOM::ARIARoleNames::generic; }
+
 private:
     HTMLSpanElement(DOM::Document&, DOM::QualifiedName);
 };