title: How to prefetch correctly a CSS file?
body: <p>I use two CSS files, one is a little one for my <code>home.html</code> with all the important things for this page and there I pre fetch a bigger CSS file that takes care of the internal structure. </p>
  
  <p>It works as I want but when I try to pass the W3C validation it complains with:</p>
  
  <blockquote>
    <p>Error: A <code>link</code> element with an <code>as</code> attribute must have a <code>rel</code> attribute
    that contains the value <code>preload</code>.  </p>
  
  <pre><code>&lt;link rel="prefetch alternate stylesheet" href="/css/internal.css" as="style"&gt;
  </code></pre>
  </blockquote>
  
  <p>Can I get rid correctly of this? </p>