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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>
+ setup({"hide_test_state": true});
+ 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>