third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/sandboxed-iframe-fetch-event-iframe.html

<script>
function with_iframe(url) {
  return new Promise(function(resolve) {
      var frame = document.createElement('iframe');
      frame.src = url;
      frame.onload = function() { resolve(frame); };
      document.body.appendChild(frame);
    });
}

function with_sandboxed_iframe(url, sandbox) {
  return new Promise(function(resolve) {
      var frame = document.createElement('iframe');
      frame.sandbox = sandbox;
      frame.src = url;
      frame.onload = function() { resolve(frame); };
      document.body.appendChild(frame);
    });
}

function fetch_in_worker() {
  return new Promise((resolve) => {
    var blob = new Blob([
      "fetch('" + location.href + "_workerfetch', {mode: 'no-cors'})" +
      "  .then(() => { self.postMessage('OK'); });"]);
    var url = URL.createObjectURL(blob);
    var worker = new Worker(url);
    worker.onmessage = resolve;
  });
}

window.onmessage = function (e) {
  var id = e.data['id'];
  fetch(location.href + "_fetch", {mode: 'no-cors'})
    .then(function() {
        return fetch_in_worker();
      })
    .then(function() {
        return with_iframe(location.href + "_iframe");
      })
    .then(function() {
        return with_sandboxed_iframe(location.href + "_script",
                                     "allow-scripts");
      })
    .then(function() {
        return with_sandboxed_iframe(location.href + "_script-origin",
                                     "allow-scripts allow-same-origin");
      })
    .then(function() {
        window.top.postMessage({id: id, result: 'done'}, '*');
      })
    .catch(function(e) {
        window.top.postMessage({id: id, result: 'error: ' + e.toString()}, '*');
      });
};
</script>