title: Prevent IFrame Navigation
body: <p>I use an <code>iframe</code> to display HTML email contents by writing a HTML string to it's content document via JS. I don't want the user to navigate inside that <code>iframe</code> if he clicks a link in the displayed email. Now I have these options:</p>
  
  <ol>
  <li>Open links in a new browser window or tab (<strong>preferred</strong>)</li>
  <li>Prevent all navigation (suboptimal, only if no other option left)</li>
  <li>Better option I don't know about?</li>
  </ol>
  
  <p>How could I accomplish any of those 2 options?</p>
  
  <p>I know that <code>HTML5</code> introduced a <code>sandbox</code> property, but unfortunately that only works in <code>Chrome</code> and <code>Safari</code>, so that's not an option.</p>