activation-start.html

Enable keyboard shortcuts

This WPT test may be referenced by the following Test IDs:
- /speculation-rules/prerender/activation-start.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>PerformanceNavigationTiming's activationStart in prerendered page</title>

<meta name="timeout" content="long">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/common/utils.js"></script>

<script src="/common/dispatcher/dispatcher.js"></script>

<script src="/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js"></script>

<script src="../resources/utils.js"></script>

<script src="resources/utils.js"></script>

<body>

<script>

setup(() => assertSpeculationRulesIsSupported());

promise_test(async t => {

  const ACTIVATION_DELAY = 10;

  const rcHelper = new RemoteContextHelper();

  const referrerRC = await rcHelper.addWindow(undefined, { features: 'noopener' });

  const prerenderedRC = await addPrerenderRC(referrerRC);

  const iframeRC = await prerenderedRC.addIframe();

  assert_equals(

    await getActivationStart(prerenderedRC),

0,

    'activationStart must be 0 while prerendering'

);

  assert_equals(

    await getActivationStart(iframeRC),

0,

    'activationStart must be 0 while prerendering the iframe'

);

  // Wait ACTIVATION_DELAY ms before activation.

  await new Promise(resolve => t.step_timeout(resolve, ACTIVATION_DELAY));

  await activatePrerenderRC(referrerRC, prerenderedRC);

  assert_greater_than_equal(

    await getActivationStart(prerenderedRC),

    ACTIVATION_DELAY,

    'activationStart after activation must be greater than or equal to ' +

    'ACTIVATION_DELAY'

);

  assert_greater_than_equal(

    await getActivationStart(iframeRC),

    ACTIVATION_DELAY,

    'activationStart after activation must be greater than or equal to ' +

    'ACTIVATION_DELAY in the iframe'

);

});

// A utility to both extract activationStart from the prerendered

// RemoteContextWrapper, and also check that it shows up in toJSON().

async function getActivationStart(prerenderedRC) {

  const [activationStart, activationStartInToJSON] = await prerenderedRC.executeScript(() => {

    const entry = performance.getEntriesByType("navigation")[0];

    return [entry.activationStart, entry.toJSON().activationStart];

});

  assert_equals(

    activationStart,

    activationStartInToJSON,

    "activationStart value must be available in the result of toJSON()"

);

  return activationStart;

</script>