<csstest def=":checked pseudo-class" module="W3C Selectors" modulename="css3-modsel" number="25" rev="1.1" date="29-may-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>
<author>Ian Hickson</author>

<cssrules>input, span { background-color : red }
input:checked, input:checked + span { background-color : lime}
</cssrules>

<code>
<p xmlns="http://www.w3.org/1999/xhtml">
<input type="checkbox" checked="checked"/> <span>Everything in this paragraph should have a green background</span></p>
</code>
</csstest>