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<!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>
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>
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