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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 is the default value 1.
const navigationIds = await NavigationIdsFromLCP();
assert_true(navigationIds.every(e => e.navigationId == 1), 'Navigation Id\
of LCP entries should be default value 1 at initial navigations');
// Assert navigation id exists in a NavigationTiming entry and is the
// default value 1.
const navigationId = performance.getEntriesByType('navigation')[0].navigationId;
assert_equals(navigationId, 1, 'Navigation Id of an navigation timing\
entry should be default value 1 at initial navigations');
// Assert navigation id exists in PaintTiming entries and is the default
// value 1.
assert_true(performance.getEntriesByType('paint').every(e =>
e.navigationId == 1),
'Navigation Id of PaintTiming entries should be default value 1 at\
initial navigations.');
}, 'Navigation Id should be 1 at initial navigations.');
</script>
</body>
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