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Test Info: Warnings

<meta charset=utf-8>
<title>Largest Contentful Paint: do NOT observe elements from same-origin iframes</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
async_test((t) => {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
const observer = new PerformanceObserver(
t.step_func_done(entryList => {
assert_unreached("Should not have received an entry!");
observer.observe({type: 'largest-contentful-paint', buffered: true});
// After a delay, assume that no entry was produced.
t.step_timeout(() => {
}, 200);
}, 'Element in child iframe is not observed, even if same-origin.');
<iframe src='resources/iframe-with-content.html'></iframe>