Blame layout/base/crashtests/735943.html

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<html class="reftest-wait">
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<head>
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<script>
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var asvg = '<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><script xlink:href="data:text/javascript," /><rect width="100" height="100" fill="green"><set attributeName="fill" attributeType="CSS" to="red" begin="0s" end="2s" dur="2s" fill="remove" /></rect></svg>';
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function boom()
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{
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  var f = document.createElementNS("http://www.w3.org/1999/xhtml", "iframe"); f.src = "data:text/html,1"; document.body.appendChild(f);
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  var w;
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  setTimeout(function() {
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    w = window.open("data:text/html,<body onload=window.close()>", "_blank", "width=200,height=200");
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    // Note that most of the code below will execute before the window appears, and in fact before "w" becomes non-null.
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  }, 0);
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  setTimeout(function() {
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    setTimeout(function() { }, 0);
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    f.contentWindow.location = "data:image/svg+xml," + encodeURIComponent(asvg);
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    setTimeout(function() {
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      setTimeout(function() {
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        setTimeout(function() {
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          document.body.style.MozColumnCount = "2";
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          document.documentElement.className = "";
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        }, 20);
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      }, 0);
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    }, 0);
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  }, 20);
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}
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    window.addEventListener("MozReftestInvalidate", boom);
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</script>
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</head>
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<body></body>
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</html>