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<!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>
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