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+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>Element Timing: observe elements with the same resource</title>
+<body>
+<style>
+body {
+ margin: 0;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/element-timing-helpers.js"></script>
+<script>
+ let beforeRender;
+ let numEntries = 0;
+ let loadTime1;
+ let loadTime2;
+ let renderTime1;
+ let renderTime2;
+ let img;
+ let img2;
+ async_test(function (t) {
+ assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
+ const observer = new PerformanceObserver(
+ t.step_func(function(entryList) {
+ assert_equals(entryList.getEntries().length, 1);
+ const entry = entryList.getEntries()[0];
+ const pathname = window.location.origin + '/element-timing/resources/square100.png';
+ // Easier to check the |element| attribute here since element ID is the same for both images.
+ checkElement(entry, pathname, entry.identifier, 'image_id', beforeRender, null);
+ checkNaturalSize(entry, 100, 100);
+ if (entry.identifier === 'my_image') {
+ ++numEntries;
+ loadTime1 = entry.loadTime;
+ renderTime1 = entry.renderTime;
+ assert_equals(entry.element, img);
+
+ img2 = document.createElement('img');
+ img2.src = 'resources/square100.png';
+ img2.setAttribute('elementtiming', 'my_image2');
+ img2.setAttribute('id', 'image_id');
+ document.body.appendChild(img2);
+ beforeRender = performance.now();
+ }
+ else if (entry.identifier === 'my_image2') {
+ ++numEntries;
+ loadTime2 = entry.loadTime;
+ renderTime2 = entry.renderTime;
+ assert_equals(entry.element, img2);
+ }
+ if (numEntries == 2) {
+ assert_greater_than(loadTime2, loadTime1, 'Second image loads after first.');
+ assert_greater_than(renderTime2, renderTime1, 'Second image renders after first');
+ t.done();
+ }
+ })
+ );
+ observer.observe({entryTypes: ['element']});
+ // We add the images during onload to be sure that the observer is registered
+ // in time for it to observe the element timing.
+ window.onload = () => {
+ // Add image of width and height equal to 100.
+ img = document.createElement('img');
+ img.src = 'resources/square100.png';
+ img.setAttribute('elementtiming', 'my_image');
+ img.setAttribute('id', 'image_id');
+ document.body.appendChild(img);
+ beforeRender = performance.now();
+ };
+ }, 'Elements with elementtiming and same src are observable.');
+</script>
+
+</body>