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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: do not observe image in shadow tree</title>
<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>
<div id='target'></div>
<script>
async_test(function (t) {
assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
const observer = new PerformanceObserver(
t.step_func_done(function(entryList) {
assert_unreached('Should not observe elements in shadow trees!');
})
);
observer.observe({entryTypes: ['element']});
// We add the image 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 equal to 100 and height equal to 100.
const img = document.createElement('img');
img.src = 'resources/square100.png';
img.setAttribute('elementtiming', 'my_image');
img.setAttribute('id', 'my_id');
const shadowRoot = document.getElementById('target').attachShadow({mode: 'open'});
shadowRoot.appendChild(img);
t.step_timeout(() => {
// Assume entry was not dispatched, so test passes.
t.done();
}, 500);
};
}, 'Image in shadow tree with elementtiming attribute is not observable.');
</script>
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