LibWeb: Add fast_is<HTMLBaseElement>()

This avoids slow RTTI lookups in Document::base_url().

1 files changed, 7 insertions, 0 deletions

diff --git a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
index 13afb78cfc..0c904246cb 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
+++ b/Userland/Libraries/LibWeb/HTML/HTMLBaseElement.h
@@ -26,6 +26,8 @@ public:
     virtual void parse_attribute(FlyString const& name, String const& value) override;
 
 private:
+    virtual bool is_html_base_element() const override { return true; }
+
     // https://html.spec.whatwg.org/multipage/semantics.html#frozen-base-url
     // A base element that is the first base element with an href content attribute in a document tree has a frozen base URL.
     AK::URL m_frozen_base_url;
@@ -34,3 +36,8 @@ private:
 };
 
 }
+
+namespace Web::DOM {
+template<>
+inline bool Node::fast_is<HTML::HTMLBaseElement>() const { return is_html_base_element(); }
+}