LibWeb: Support bgcolor attribute on tr elements

Author: https://github.com/warpdesign 🔰
Commit: 876ad69ea3
Pull-request: https://github.com/SerenityOS/serenity/pull/19794
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/HTML/HTMLTableRowElement.h

@@ -32,6 +32,7 @@ private:
 
     virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
     virtual void visit_edges(Cell::Visitor&) override;
+    virtual void apply_presentational_hints(CSS::StyleProperties&) const override;
 
     JS::GCPtr<DOM::HTMLCollection> mutable m_cells;
 };