same-origin-redirects.html

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This WPT test may be referenced by the following Test IDs:
- /largest-contentful-paint/same-origin-redirects.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8" />

<title>This test validates LargestContentfulPaint for same-origin redirect chain.</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/largest-contentful-paint-helpers.js"></script>

</head>

<body>

<script>

async_test(t => {

    assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");

    // First redirect

    let destUrl = '/common/redirect.py?location='

    // Second redirect

    destUrl += '/common/redirect.py?location='

    // Image without TAO headers.

    destUrl += '/element-timing/resources/square20.png';

    let beforeLoad;

    new PerformanceObserver(t.step_func_done(entries => {

        assert_equals(entries.getEntries().length, 1, 'There should be one entry');

        const entry = entries.getEntries()[0];

        checkImage(entry, location.origin + destUrl, 'id', 20*20, beforeLoad);

    })).observe({entryTypes: ['largest-contentful-paint']});

    const image = document.createElement('img');

    image.src = destUrl;

    image.setAttribute('id', 'id')

    document.body.appendChild(image);

    beforeLoad = performance.now();

}, 'Same-origin image redirect without TAO should have its renderTime set.');

</script>

</body>

</html>