LibWeb: Support cellpadding attribute on table elements

Author: https://github.com/implicitfield
Commit: 00c1da8cbc
Pull-request: https://github.com/SerenityOS/serenity/pull/22000
Reviewed-by: https://github.com/kalenikaliaksandr ✅

Userland/Libraries/LibWeb/HTML/HTMLTableElement.h

@@ -47,6 +47,7 @@ public:
     virtual Optional<ARIA::Role> default_role() const override { return ARIA::Role::table; }
 
     unsigned border() const;
+    unsigned padding() const;
 
 private:
     HTMLTableElement(DOM::Document&, DOM::QualifiedName);
@@ -57,9 +58,11 @@ private:
     virtual void visit_edges(Cell::Visitor&) override;
 
     virtual void apply_presentational_hints(CSS::StyleProperties&) const override;
+    virtual void attribute_changed(FlyString const& name, Optional<String> const& value) override;
 
     JS::GCPtr<DOM::HTMLCollection> mutable m_rows;
     JS::GCPtr<DOM::HTMLCollection> mutable m_t_bodies;
+    unsigned m_padding { 1 };
 };
 
 }