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diff --git a/testing/web-platform/tests/largest-contentful-paint/image-sw-same-origin.https.html b/testing/web-platform/tests/largest-contentful-paint/image-sw-same-origin.https.html
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+++ b/testing/web-platform/tests/largest-contentful-paint/image-sw-same-origin.https.html
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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>