Blame layout/generic/crashtests/534366-2.html
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<html>
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<head>
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<style type="text/css">
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body { font-family: monospace; width: 4ch; }
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body::first-line { }
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body *::before { content: 'w';}
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</style>
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<script type="text/javascript">
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function boom()
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{
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var de = document.documentElement;
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var body = document.body;
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var span = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
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var r1 = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mrow");
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var mmm = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mmultiscripts");
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body.appendChild(span);
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r1.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", "mrow"));
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body.appendChild(r1);
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body.appendChild(mmm);
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de.offsetHeight;
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r1.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", 'mrow'));
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de.offsetHeight;
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mmm.appendChild(document.createElementNS("http://www.w3.org/1998/Math/MathML", 'mrow'));
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de.offsetHeight;
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document.removeChild(de);
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document.appendChild(de);
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de.offsetHeight;
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}
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window.addEventListener("load", boom);
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</script>
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</head>
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<body></body>
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</html>
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