File: postmessage-to-service-worker.html

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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<script src="/speculation-rules/prerender/resources/deferred-promise-utils.js"></script>
<script>

const params = new URLSearchParams(location.search);

// The main test page (restriction-service-worker-postmessage.https.html) loads
// the initiator page, then the initiator page will prerender itself with the
// `prerendering` parameter.
const isPrerendering = params.has('prerendering');

if (!isPrerendering) {
  loadInitiatorPage();
} else {
  assert_not_equals(navigator.serviceWorker.controller, null,
                    'prerendered page should be controlled');

  const prerenderEventCollector = new PrerenderEventCollector();

  // Promise to wait for a reply from the service worker.
  const messagePromise = new Promise(resolve => {
    navigator.serviceWorker.onmessage = e => {
      prerenderEventCollector.addEvent(e.data);
      resolve();
    };
  });
  navigator.serviceWorker.controller.postMessage('postmessage to worker');

  prerenderEventCollector.start(messagePromise, 'ServiceWorker.postMessage');
}

</script>