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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Largest Contentful Paint: observe 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");
+ const beforeLoad = performance.now();
+ const observer = new PerformanceObserver(
+ t.step_func_done(function(entryList) {
+ assert_equals(entryList.getEntries().length, 1);
+ const entry = entryList.getEntries()[0];
+ const url = window.location.origin + '/images/blue.png';
+ // blue.png is 133 by 106.
+ const size = 133 * 106;
+ checkImage(entry, url, 'image_id', size, beforeLoad);
+ })
+ );
+ observer.observe({type: 'largest-contentful-paint', buffered: true});
+ }, 'Same-origin image is observable.');
+</script>
+
+<img src='/images/blue.png' id='image_id'/>
+</body>