navigation-id-initial-load.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /performance-timeline/navigation-id-initial-load.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

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

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

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

<!--

Navigation timing, LCP and paint timing entries are only emitted during initial

load, not after a bfcache navigation. Therefore we only verify the existence of

navigation id, not the increment.

-->

<body>

  <p>This text is to trigger a LCP entry emission.</p>

  <script>

    async function NavigationIdsFromLCP() {

      return new Promise(resolve => {

        new PerformanceObserver((entryList) => {

          resolve(entryList.getEntries());

        }).observe({ type: 'largest-contentful-paint', buffered: true });

})

    promise_test(async t => {

      // Assert navigation id exists in LCP entries and and are all the same.

      const navigationIdsOfLCP = (await NavigationIdsFromLCP()).map(e => e.navigationId);

      assert_true(navigationIdsOfLCP.every(e => e == navigationIdsOfLCP[0]),

        'Navigation Ids of LCP entries should be the same at initial navigation');

      // Assert navigation id exists in a NavigationTiming entry.

      const navigationIdOfNavigationTiming =

        performance.getEntriesByType('navigation')[0].navigationId;

      assert_true(!!navigationIdOfNavigationTiming,

        'Navigation Id of a navigation timing entry should exist at initial navigation');

      // Assert navigation id exists in PaintTiming entries and are all the same.

      const navigationIdsOfPaintTiming =

        performance.getEntriesByType('paint').map(e => e.navigationId);

      assert_true(navigationIdsOfPaintTiming.every(e =>

        e == navigationIdsOfPaintTiming[0]),

        'Navigation Id of PaintTiming entries should be the same as the initial navigation.');

      // Assert navigation ids are all the same.

      const navigationIdsOfAll =

        navigationIdsOfLCP.concat(navigationIdsOfPaintTiming, navigationIdOfNavigationTiming);

      assert_true(navigationIdsOfAll.every(e => e == navigationIdsOfAll[0]),

        'Navigation Id of all entries should be the same as the initial navigation.');

    }, 'Navigation Ids should exist and are all the same as the initial navigation.');

  </script>

</body>