Blur immediately if an attribute change made an element unfocasable.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004-2007, 2009, 2014 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 121 matching lines @@
                             AllowPercentage = AllowPercentageValues);
   void addHTMLColorToStyle(MutableStylePropertySet*,
                            CSSPropertyID,
                            const String& color);
 
   void applyAlignmentAttributeToStyle(const AtomicString&,
                                       MutableStylePropertySet*);
   void applyBorderAttributeToStyle(const AtomicString&,
                                    MutableStylePropertySet*);
 
+  void attributeChanged(const QualifiedName&,
+                        const AtomicString&,
+                        const AtomicString&,
+                        AttributeModificationReason) override;
   void parseAttribute(const QualifiedName&,
                       const AtomicString&,
                       const AtomicString&) override;
   static bool parseColorWithLegacyRules(const String& attributeValue,
                                         Color& parsedColor);
   bool isPresentationAttribute(const QualifiedName&) const override;
   void collectStyleForPresentationAttribute(const QualifiedName&,
                                             const AtomicString&,
                                             MutableStylePropertySet*) override;
   unsigned parseBorderWidthAttribute(const AtomicString&) const;
@@ skipping 84 matching lines @@
   inline bool isElementOfType<const thisType>(const HTMLElement& element) {  \
     return is##thisType(element);                                            \
   }                                                                          \
   DEFINE_ELEMENT_TYPE_CASTS_WITH_FUNCTION(thisType)
 
 }  // namespace blink
 
 #include "core/HTMLElementTypeHelpers.h"
 
 #endif  // HTMLElement_h