third_party/WebKit/LayoutTests/fast/dom/defaultView-on-detached-document.html

   1 <!DOCTYPE html>
   2 <script src="../../resources/js-test.js"></script>
   3 <script>
   4 var jsTestIsAsync = true;
   5
   6 description("Tests that document.defaultView on a detached document doesn't crash.");
   7
   8 var cachedWindow;
   9 var cachedDocument;
  10 var testFrameUnloaded = false;
  11
  12 // DRT dumps out the number of unload handlers associated with a document once it loads.
  13 // Unfortunately, load order is not guaranteed, so wait until the first frame has finished loading
  14 // before setting up the rest of the test.
  15 function setupTest()
  16 {
  17     var frame2 = document.createElement('iframe');
  18     frame2.srcdoc = '<script>window.onunload=function() { window.top.finishTest(); };</scr' + 'ipt>';
  19     frame2.onload = runTest;
  20     document.getElementById('frames').appendChild(frame2);
  21 }
  22
  23 function runTest()
  24 {
  25     var i = document.getElementById("testFrame");
  26     // Make sure DOMWindow doesn't get GCed and clear Document's pointer back to it.
  27     cachedWindow = i.contentWindow;
  28     cachedDocument = i.contentDocument;
  29     // This test is structured to catch a document.defaultView crash when all of the following are true:
  30     // 1. Document's pointer back to DOMWindow has not yet been cleared by DOMWindow destruction.
  31     // 2. DOMWindow's pointer back to its Frame has not yet been cleared by Frame destruction.
  32     // 3. The frame is already detached.
  33     // One way to satisfy this condition is to test the value of document.defaultView when removing
  34     // a DOM node that contains multiple subframes, since ChildFrameDisconnector keeps a ref to the
  35     // affected HTMLFrameOwnerElements (and consequently the Frame) on the stack.
  36     var frameContainer = document.getElementById("frames");
  37     frameContainer.parentNode.removeChild(frameContainer);
  38 }
  39
  40 function finishTest()
  41 {
  42     shouldBeTrue("testFrameUnloaded");
  43     shouldBeUndefined("cachedDocument.defaultView");
  44     finishJSTest();
  45 }
  46 </script>
  47 <body onload="setupTest()">
  48   <div id="frames">
  49     <iframe id="testFrame" srcdoc="<script>window.onunload=function() { window.top.testFrameUnloaded = true; };</script>"></iframe>
  50   </div>
  51 </body>