ored :hovers can have serve performance degradation in IE7. IE8 is also effected by this issue but to a lesser degree. </p>

<p>The following patterns will cause an error:</p>

<div class="highlight highlight-css"><pre>
<span class="pl-c">/* :hover is not anchored with an a tag*/</span>
<span class="pl-e">.test</span> <span class="pl-e">:hover</span>{
    <span class="pl-mp"><span class="pl-s3">top</span></span>: <span class="pl-c1">10<span class="pl-k">px</span></span>;
}

<span class="pl-e">.test</span> <