ASSERTION FAILED: !style->propertyIsImportant(propertyID) in WebCore::setTextDecorationProperty

Source/core/editing/EditingStyle.cpp

 /*
  * Copyright (C) 2007, 2008, 2009 Apple Computer, Inc.
  * Copyright (C) 2010, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1389 matching lines @@
     // Save the result for later
     m_cssStyle = mutableStyle->asText().stripWhiteSpace();
 }
 
 static void setTextDecorationProperty(MutableStylePropertySet* style, const CSSValueList* newTextDecoration, CSSPropertyID propertyID)
 {
     if (newTextDecoration->length())
         style->setProperty(propertyID, newTextDecoration->cssText(), style->propertyIsImportant(propertyID));
     else {
         // text-decoration: none is redundant since it does not remove any text decorations.
-        ASSERT(!style->propertyIsImportant(propertyID));
         style->removeProperty(propertyID);
     }
 }
 
 void StyleChange::extractTextStyles(Document* document, MutableStylePropertySet* style, bool shouldUseFixedFontDefaultSize)
 {
     ASSERT(style);
 
     if (getIdentifierValue(style, CSSPropertyFontWeight) == CSSValueBold) {
         style->removeProperty(CSSPropertyFontWeight);
@@ skipping 213 matching lines @@
 {
     for (Node* ancestor = node; ancestor; ancestor = ancestor->parentNode()) {
         RefPtr<CSSComputedStyleDeclaration> ancestorStyle = CSSComputedStyleDeclaration::create(ancestor);
         if (!hasTransparentBackgroundColor(ancestorStyle.get()))
             return ancestorStyle->getPropertyCSSValue(CSSPropertyBackgroundColor);
     }
     return nullptr;
 }
 
 }