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
45
46
47
48
49
50
51
52
53
54
55
|
<!DOCTYPE html>
<head>
<link rel=author title="Aleks Totic" href="mailto:atotic@chromium.org">
<link rel=help href="https://html.spec.whatwg.org/#clean-up-after-running-script">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/common.js"></script>
</head>
<body style="height:2000px;">
<script>
/*
promise 1, promise 2 execute immediately after script tag
promise 1 child executes immediately after promise 2.
Relevant specs:
https://html.spec.whatwg.org/#clean-up-after-running-script
If the JavaScript execution context stack is now empty, perform a microtask checkpoint.
https://html.spec.whatwg.org/#perform-a-microtask-checkpoint
"perform a microtask checkpoint" runs in a loop until all microtasks have been delivered.
*/
var test = async_test("Microtask immediately after script");
var events = [];
Promise.resolve()
.then(function() {
events.push("promise 1");
return Promise.resolve();
})
.then(function() {
test.step(function() {
events.push("promise 1 child");
assert_array_equals(events, ["promise 1", "promise 2", "promise 1 child"]);
test.done();
});
});
Promise.resolve()
.then(function() {
events.push("promise 2");
});
// Set up events that must be executed after Promise.
window.setTimeout(function() {
events.push('timeout');
}, 0);
window.addEventListener('scroll', function() {
events.push('scroll');
});
window.scrollBy(0,10);
</script>
</body>
|
