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chromium/third_party/blink/web_tests/external/wpt/mathml/crashtests/mozilla/403156-1.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:m="http://www.w3.org/1998/Math/MathML">

<head>
<style>
maction { height: 12em; }
</style>
</head>

<body>
<m:maction>&#x499a;<span>c<div>t&#x499a;</div></span>&#x499a;x&#x499a;&#x499a;2</m:maction>
</body>
</html>