clr</span>: <span class="pl-c1">red</span>;<br/>}<br/><br/><span class="pl-c">/* 'foo' isn't a valid color */</span><br/><span class="pl-ent">a</span> {<br/>    <span class="pl-c1"><span class="pl-c1">color</span></span>: foo;<br/>}</pre></div>

<p>The following pattern is considered okay and does not cause a warning:</p>

<div class="highlight highlight-source-css"><pre><span class="pl-c">/* -moz- is a vendor prefix, so ignore */</span><br/><span class="pl-ent">a</span> {<br/>    <span class="pl-c1">-moz-f