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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Largest Contentful Paint: src change triggers new entry.</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/largest-contentful-paint-helpers.js"></script>
<img src='/images/green-1x1.png' id='image_id' width="133" height="106"/>
<script>
async_test(function (t) {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
let beforeLoad = performance.now();
document.getElementById('image_id').src = '/images/blue.png';
const url = window.location.origin + '/images/blue.png';
const observer = new PerformanceObserver(
t.step_func(function(entryList) {
let entries = entryList.getEntries().filter(e => e.url === url);
if (entries.length === 0)
return;
assert_equals(entries.length, 1);
const entry = entries[0];
// blue.png is 133 by 106.
const size = 133 * 106;
checkImage(entry, url, 'image_id', size, beforeLoad);
t.done();
})
);
observer.observe({type: 'largest-contentful-paint', buffered: true});
}, 'Largest Contentful Paint: changing src causes a new entry to be dispatched.');
</script>
</body>
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