title: Can HTML5 sessionStorage be written to disk?
body: <p>(Related to <a href="https://stackoverflow.com/questions/304086/is-there-a-secure-browser-cache">Is there a secure Browser Cache?</a> ):</p>
  
  <p>Do any of the implementations of HTML5 session storage write to disk ever?</p>
  
  <p>e.g. can I rely on having a "secure"/"private" cache that I know will not be able to persist beyond the browser session whether it </p>
  
  <ul>
  <li>times out</li>
  <li>is ended/logs out</li>
  <li>browser closes/crashes/power button on computer</li>
  </ul>
  
  <p>See </p>
  
  <ul>
  <li><a href="http://www.whatwg.org/specs/web-apps/current-work/#appcache" rel="nofollow noreferrer">HTML5 Browser Application Cache</a></li>
  <li><a href="http://www.whatwg.org/specs/web-apps/current-work/#the-sessionstorage-attribute" rel="nofollow noreferrer">HTML5 sessionStorage</a></li>
  </ul>