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>Resource Timing should not include internal resources</title>
<link rel="author" title="Google" href="http://www.google.com/" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/get-host-info.sub.js"></script>
<p>This test validates that image resources which are part of an element's
UA-defined interface are not exposed to the performance timeline. This uses an
<audio> element as an example of an element with internal resources used
for the playback controls, and verifies that resource timing entries are not
created.
</p>
<!-- This element will render with internal resources for playback controls -->
<audio controls></audio>
<script>
async_test(t => {
const observer = new PerformanceObserver(t.step_func_done(events => {
events.getEntries().forEach(entry => {
assert_true(entry.initiatorType == "script" || entry.initiatorType == "img",
"Resources loaded from this test should have initiatorType 'script' or 'img', but \"" +
entry.name + "\" has '" + entry.initiatorType + "'.");
});
}));
// Wait for one more resource to load before attaching listener, and then get
// buffered entries.
const image = document.createElement("img");
image.src = "resources/blue.png";
image.addEventListener("load", t.step_func(ev => {
observer.observe({type: "resource", buffered: true});
}));
document.body.appendChild(image);
}, "Resource timing should not include internal resources.");
</script>
|
