LibWeb: Implement HTMLAreaElement.referrerPolicy

Author: https://github.com/jamierocks
Commit: 8f2cb6755b
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/23

Userland/Libraries/LibWeb/HTML/HTMLAnchorElement.cpp

@@ -61,6 +61,11 @@ WebIDL::ExceptionOr<void> HTMLAnchorElement::set_hyperlink_element_utils_href(St
     return set_attribute(HTML::AttributeNames::href, move(href));
 }
 
+Optional<String> HTMLAnchorElement::hyperlink_element_utils_referrerpolicy() const
+{
+    return attribute(HTML::AttributeNames::referrerpolicy);
+}
+
 bool HTMLAnchorElement::has_activation_behavior() const
 {
     return true;