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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Largest Contentful Paint: largest image is reported.</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/largest-contentful-paint-helpers.js"></script>
<img id="target"/>
<img id="target2"/>
<script>
const numInitial = 100;
const sleep = 1000;
const small_img_src = '/images/green-16x16.png';
let beforeLoad;
async_test(function (t) {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
const img_src = '/element-timing/resources/progressive-image.py?name=square20.jpg&numInitial='
+ numInitial + '&sleep=' + sleep;
const img1 = document.getElementById('target')
img1.src = img_src;
// After a brief wait, remove the image and add a smaller image to target2.
t.step_timeout(() => {
img1.parentNode.removeChild(img1);
document.getElementById('target2').src = small_img_src;
beforeLoad = performance.now();
}, 0);
new PerformanceObserver(
t.step_func(entryList => {
let images = entryList.getEntries().filter(e => e.id !== '');
if (!images.length)
return;
assert_equals(images.length, 1, 'Should only receive one entry');
const entry = images[0];
checkImage(images[0], window.location.origin + small_img_src, 'target2', 16 * 16,
beforeLoad);
t.done();
})
).observe({type: 'largest-contentful-paint', buffered: true});
}, 'Largest Contentful Paint: image removed before loaded does not produce entry.');
</script>
</body>
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