css3-modsel-149.xml
<csstest def=":empty pseudo-class and empty elements" module="W3C Selectors" modulename="css3-modsel" number="149" rev="1.0" date="15-november-2001" xmlns="http://www.example.org/css3tests">
<author>Ian Hickson</author>
<cssrules>
address:empty { background: lime; }
address { background: red; margin: 0; height: 1em; }
.text { margin: -1em 0 0 0; }
</cssrules>
<code>
<address xmlns="http://www.w3.org/1999/xhtml"/>
<div class="text" xmlns="http://www.w3.org/1999/xhtml">This line should have a green background.</div>
</code>
</csstest>