<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<maction xmlns="http://www.w3.org/1998/Math/MathML">Foo Bar</maction>
</body>
</html>
Codebase Browser
chromium
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<maction xmlns="http://www.w3.org/1998/Math/MathML">Foo Bar</maction>
</body>
</html>