<csstest def=":before pseudo-element" module="W3C Selectors" modulename="css3-modsel" number="41a" rev="1.0" date="30-march-2004" xmlns:a="http://www.example.org/a" xmlns:b="http://www.example.org/b" xmlns:html="http://www.w3.org/1999/xhtml" xmlns="http://www.example.org/css3tests">

<author>Daniel Glazman</author>

<cssrules>p:before { background-color : lime ; content : "GENERATED CONTENT "}
</cssrules>
<code>
<p xmlns="http://www.w3.org/1999/xhtml">You should see before this paragraph the words GENERATED CONTENT over green background</p>
</code>
</csstest>