<?xml-stylesheet href="css3-modsel-19b.css" type="text/css"?>
<test xmlns:a="http://www.example.org/a" xmlns:b="http://www.example.org/b" xmlns:html="http://www.w3.org/1999/xhtml">
<p xmlns="http://www.w3.org/1999/xhtml"><button>Activating (e.g. holding the mouse button down on) this button should make it go green.</button></p>
</test>