image-sw-same-origin.https.html | Explore in Territory

<!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>

chromium/third_party/blink/web_tests/external/wpt/largest-contentful-paint/image-sw-same-origin.https.html