Rendering text to a canvas in a frame-less document.

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2865 matching lines @@
     if (!hasRareData() && size == defaultMinimumSizeForResizing())
         return;
     ensureElementRareData().setMinimumSizeForResizing(size);
 }
 
 const ComputedStyle* Element::ensureComputedStyle(PseudoId pseudoElementSpecifier)
 {
     if (PseudoElement* element = pseudoElement(pseudoElementSpecifier))
         return element->ensureComputedStyle();
 
-    if (!inActiveDocument()) {
+    if (!inActiveDocument() && document().frame()) {
         // FIXME: Try to do better than this. Ensure that styleForElement() works for elements that are not in the
         // document tree and figure out when to destroy the computed style for such elements.
         return nullptr;
     }
 
     // FIXME: Find and use the layoutObject from the pseudo element instead of the actual element so that the 'length'
     // properties, which are only known by the layoutObject because it did the layout, will be correct and so that the
     // values returned for the ":selection" pseudo-element will be correct.
     ComputedStyle* elementStyle = mutableComputedStyle();
     if (!elementStyle) {
@@ skipping 925 matching lines @@
 
 DEFINE_TRACE_WRAPPERS(Element)
 {
     if (hasRareData()) {
         visitor->traceWrappers(elementRareData());
     }
     ContainerNode::traceWrappers(visitor);
 }
 
 } // namespace blink