title: mod_pagespeed conditional css
body: <p>I am using rewrite_css config and found a problem.  Conditional CSS files inside HTML comments are ignored by mod_pagespeed.</p>
  
  <pre><code>    &lt;!--[if (IE 7) | (IE 8)]&gt;
          &lt;link href="mycss.css" rel="stylesheet"/&gt;
      &lt;![endif]--&gt;
  </code></pre>
  
  <p>However, this style does work:</p>
  
  <pre><code>    &lt;!--[if (IE 7) | (IE 8)]&gt;&lt;!--&gt;
          &lt;link href="mycss.css" rel="stylesheet"/&gt;
      &lt;!--&lt;![endif]--&gt;
  </code></pre>
  
  <p>The first of the two is ignored by browsers, which do not support conditional comments. The second isn't.  Bottom line: there are subtle differences between the two: <a href="http://msdn.microsoft.com/en-us/library/ms537512(v=vs.85).aspx#dlhidden" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms537512(v=vs.85).aspx#dlhidden</a></p>
  
  <p>So I don't want to change how the page is set up as it can have negative consequences. Ideally, I'd like to coax mod_pagespeed into rewriting the css inside the comment.  Are there any ways to make that happen?</p>