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
|
<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: observe larger element with stretched background image</title>
<body>
<style>
body {
margin: 0;
}
#target {
width: 200px;
height: 150px;
background-image: url('resources/square100.png');
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
let beforeRender = performance.now();
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/square100.png';
checkElement(entry, pathname, 'my_div', 'target', beforeRender,
document.getElementById('target'));
// The background image extends to occupy to full size of the div.
checkRect(entry, [0, 200, 0, 150]);
// The natural size of the square remains unchanged.
checkNaturalSize(entry, 100, 100);
})
);
observer.observe({entryTypes: ['element']});
}, 'Element with background image shows correct image size.');
</script>
<div id='target' elementtiming='my_div'></div>
</body>
|
