title: how to prefetch / cache iframe content?
body: <p>i have a iframe and it takes a while for for the content to come back. I can't avoid using the iframe, so i'm wondering if i can somehow:</p>
  
  <ol>
  <li>cache the content, so that when i revisit the page, it loads very fast.</li>
  <li>prefetch the page that has the iframe on it. Here I've tried using <code>&lt;link rel="prefetch" href="..." /&gt;</code>, but it seems that it has no effect on the iframe</li>
  </ol>
  
  <p>any ideas how to solve this issue? Can be a front end or a back end solution?</p>