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
33
34
35
36
37
38
39
40
41
42
43
44
|
<!DOCTYPE HTML>
<head>
<meta charset=utf-8>
<title>Element Timing: observe an object containing an image</title>
<style>
body {
margin: 20px;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
async_test(function (t) {
let beforeRender;
let object;
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 + '/images/green-100x50.png';
checkElement(entry, pathname, 'my_object', 'rectangle', beforeRender, object);
checkRect(entry, [20, 120, 20, 70]);
checkNaturalSize(entry, 100, 50);
})
);
observer.observe({entryTypes: ['element']});
// We add the object during onload to be sure that the observer is
// registered in time for it to observe the element timing.
window.onload = () => {
// Add object of width equal to 100 and height equal to 50.
object = document.createElement('object');
object.type = 'image/png';
object.id = 'rectangle';
object.data = '/images/green-100x50.png';
object.setAttribute('elementtiming', 'my_object');
document.body.appendChild(object);
beforeRender = performance.now();
};
}, 'Element with an object containing an image.');
</script>
</head>
|
