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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Largest Contentful Paint: repeated image.</title>
<style>
#image_id {
width: 10px;
height: 10px;
}
</style>
<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 = performance.now();
let firstCallback = true;
const url = window.location.origin + '/images/black-rectangle.png';
const observer = new PerformanceObserver(
t.step_func(entryList => {
assert_equals(entryList.getEntries().length, 1);
const entry = entryList.getEntries()[0];
// First image is shrunk to be 10 x 10. The second image is added at its natural size: 100 x 50.
const size = firstCallback ? 10 * 10 : 100 * 50;
const id = firstCallback ? 'image_id' : 'second_id';
checkImage(entry, url, id, size, beforeLoad);
if (firstCallback) {
const img = document.createElement('img');
img.src = '/images/black-rectangle.png';
img.id = 'second_id';
beforeLoad = performance.now();
document.getElementById('image_div').appendChild(img);
firstCallback = false;
return;
} else {
t.done();
}
})
);
observer.observe({type: 'largest-contentful-paint', buffered: true});
}, 'Repeated image produces different timestamps.');
</script>
<img src='/images/black-rectangle.png' id='image_id'/>
<div id='image_div'></div>
</body>
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