testing/web-platform/tests/layout-instability/shift-with-counterscroll.html


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

<!DOCTYPE html>
<title>Layout Instability: shift with counterscroll not counted</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>

#s {
  overflow: scroll;
  position: absolute;
  left: 20px;
  top: 20px;
  width: 200px;
  height: 200px;
}
#sp {
  width: 170px;
  height: 600px;
}
#ch {
  position: relative;
  background: yellow;
  left: 10px;
  top: 100px;
  width: 150px;
  height: 150px;
}

</style>
<div id="s">
  <div id="sp">
    <div id="ch"></div>
  </div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<script>

promise_test(async () => {
  const watcher = new ScoreWatcher;

  // Wait for the initial render to complete.
  await waitForAnimationFrames(2);

  let scroller = document.querySelector("#s");
  let changer = document.querySelector("#ch");

  changer.style.top = "200px";
  scroller.scrollTop = 100;

  await waitForAnimationFrames(3);
  assert_equals(watcher.score, 0);
}, "Shift with counterscroll not counted.");

</script>