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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Largest Contentful Paint: delayed appended image.</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/largest-contentful-paint-helpers.js"></script>
<script>
async_test(function (t) {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
let beforeLoad;
const observer = new PerformanceObserver(
t.step_func_done(entryList => {
assert_equals(entryList.getEntries().length, 1);
const entry = entryList.getEntries()[0];
const url = window.location.origin + '/images/black-rectangle.png';
// blue.png is 100 by 50.
const size = 100 * 50;
checkImage(entry, url, 'image_id', size, beforeLoad);
})
);
observer.observe({type: 'largest-contentful-paint', buffered: true});
const img = document.createElement('img');
img.src = '/images/black-rectangle.png';
img.id = 'image_id';
t.step_timeout(() => {
beforeLoad = performance.now();
document.getElementById('image_div').appendChild(img);
}, 200)
}, 'Image loadTime occurs after appendChild is called.');
</script>
<div id='image_div'></div>
</body>
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