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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: observe with empty elementtiming attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
let beforeRender;
async_test(function (t) {
assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
let observedImage = false;
let observedText = false;
const observer = new PerformanceObserver(
t.step_func(function(entryList) {
entryList.getEntries().forEach(entry => {
if (entry.name === 'image-paint') {
assert_false(observedImage, 'Image should only be observed once.');
const pathname = window.location.origin + '/element-timing/resources/square20.png';
checkElement(entry, pathname, '', 'square', beforeRender,
document.getElementById('square'));
checkNaturalSize(entry, 20, 20);
observedImage = true;
} else {
assert_false(observedText, 'Text should only be observed once.');
checkTextElement(entry, '', 'text', beforeRender, document.getElementById('text'));
observedText = true;
}
});
if (observedImage && observedText)
t.done();
})
);
observer.observe({type: 'element', buffered: true});
beforeRender = performance.now();
}, "Able to observe image and text with empty elementtiming attribute.");
</script>
<img id='square' src='resources/square20.png' elementtiming/>
<p id='text' elementtiming>Text!</p>
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