output should not match to :enabled or :disabled pseudo classes.

third_party/WebKit/Source/core/html/HTMLOptGroupElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 37 matching lines @@
 private:
     explicit HTMLOptGroupElement(Document&);
 
     bool supportsFocus() const override;
     void parseAttribute(const QualifiedName&, const AtomicString&, const AtomicString&) override;
     void childrenChanged(const ChildrenChange&) override;
     void accessKeyAction(bool sendMouseEvents) override;
     void didAddUserAgentShadowRoot(ShadowRoot&) override;
     void attach(const AttachContext& = AttachContext()) override;
     void detach(const AttachContext& = AttachContext()) override;
+    bool matchesEnabledPseudoClass() const override;
 
     // <optgroup> might not have a layoutObject so we manually manage a cached style.
     void updateNonComputedStyle();
     ComputedStyle* nonLayoutObjectComputedStyle() const override;
     PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
 
     void updateGroupLabel();
     void recalcSelectOptions();
 
     RefPtr<ComputedStyle> m_style;
 };
 
 } // namespace blink
 
 #endif // HTMLOptGroupElement_h