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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Largest Contentful Paint: same-origin service worker should not be treated as TAO-fail</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/largest-contentful-paint-helpers.js"></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<script>
setup(() => {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
});
promise_test(async t => {
const scope = "resources/lcp-sw.https.html";
const registration =
await service_worker_unregister_and_register(t, "resources/lcp-sw-from-cache.js", "resources/");
await wait_for_state(t, registration.installing, "activated");
t.add_cleanup(() => registration.unregister());
const iframe = document.createElement("iframe");
iframe.src = scope;
document.body.appendChild(iframe);
t.add_cleanup(() => iframe.remove());
const entry = await new Promise(resolve => window.addEventListener("message", e => resolve(e.data)));
assert_equals(entry.id, "theImage");
assert_not_equals(entry.renderTime, 0);
}, "Same-origin images served from a service-worker should have a correct renderTime");
</script>
</body>
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