css3-modsel-166a.xml
<csstest def=":first-letter with ::first-letter" module="W3C Selectors" modulename="css3-modsel" number="166a" rev="1.0" date="1-january-2001" xmlns="http://www.example.org/css3tests">
<author>Ian Hickson</author>
<cssrules>
p::first-letter { background-color: red; }
p:first-letter { background-color: lime; }
</cssrules>
<code>
<p xmlns="http://www.w3.org/1999/xhtml">The first letter of this paragraph should have a green background.</p>
</code>
</csstest>