gecko-dev/layout/style/crashtests/469432-1.xhtml

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HTML

<html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:mathml="http://www.w3.org/1998/Math/MathML" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<xul:menuitem>
<select/>
<xul:tooltip/>
<mathml:msup/>
</xul:menuitem>
</html>