chrome/test/data/nacl/pnacl_url_loader/pnacl_url_loader.html

<script>
window.addEventListener('load', function() {
    init();
  }, false);

function init() {
  var embed = document.createElement('embed');
  embed.addEventListener('message', function(message) {
      window.domAutomationController.send(message.data);
    }, false);
  embed.addEventListener('load', function() {
      embed.postMessage(location.hash.substr(1));
    }, false);
  // The code for this plug-in is in pnacl_url_loader.cc.
  embed.src = 'pnacl_url_loader.nmf';
  embed.type = 'application/x-pnacl';
  document.body.appendChild(embed);
}
</script>