1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: observe video poster image</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");
const observer = new PerformanceObserver(
t.step_func_done(function(entryList) {
assert_equals(entryList.getEntries().length, 1);
const entry = entryList.getEntries()[0];
const pathname = window.location.origin + '/element-timing/resources/circle.svg';
checkElement(entry, pathname, 'my_poster', 'the_poster', beforeRender,
document.getElementById('the_poster'));
// Assume viewport has size at least 200, so the element is fully visible.
checkRect(entry, [0, 200, 0, 200]);
checkNaturalSize(entry, 200, 200);
})
);
observer.observe({entryTypes: ['element']});
beforeRender = performance.now();
}, "Able to observe a video's poster image.");
</script>
<style>
body {
margin: 0;
}
</style>
<video elementtiming='my_poster' id='the_poster' src='/media/test.mp4' poster='resources/circle.svg'/>
|
