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<!DOCTYPE html>
<!-- Load the image here to put it in the image cache -->
<img src="image-20px.png">
<script>
  function ok(v, msg) {
    window.parent.postMessage({status: "ok", result: !!v, message: msg}, "*");
  }

  function done(reg) {
    ok(reg.active, "The active worker should be available.");
    window.parent.postMessage({status: "registrationdone"}, "*");
  }

  navigator.serviceWorker.ready.then(done);
  navigator.serviceWorker.register("imagecache_test.js", {scope: "."});
</script>