iframe-content-not-observed.html

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This WPT test may be referenced by the following Test IDs:
- /largest-contentful-paint/iframe-content-not-observed.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<head>

<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>

</head>

<body>

<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(() => {

      t.done();

    }, 200);

  }, 'Element in child iframe is not observed, even if same-origin.');

</script>

<iframe src='resources/iframe-with-content.html'></iframe>

</body>