-
Notifications
You must be signed in to change notification settings - Fork 3.3k
/
Copy pathposition-change-heuristic-display-none-to-abspos-change.html
71 lines (69 loc) · 2.02 KB
/
position-change-heuristic-display-none-to-abspos-change.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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1568778">
<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers">
<style>
#hidden {
display: none;
background: red;
}
#spacer {
height: calc(100vh + 200px); /* At least 200px of scroll range */
}
</style>
<table>
<thead>
<tr>
<th>1
<th>1
<th>1
<th>1
</tr>
</thead>
<thead id="hidden">
<tr>
<th>1
<th>1
<th>1
<th>1
</tr>
</thead>
<tbody>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
<tr><td>0 <td>0 <td>0 <td>0 </tr>
</tbody>
</table>
<div id="spacer"></div>
<script>
let isFirstEvent = true;
const targetScrollPosition = 100;
const hidden = document.querySelector("#hidden");
const t = async_test("Scroll offset doesn't get stuck in infinite scroll events when an element goes back and forth to display: none while changing abspos style");
window.onscroll = t.step_func(function() {
hidden.style.display = "block";
hidden.style.position = "absolute";
hidden.style.visibility = "hidden";
window.unused = hidden.offsetHeight;
hidden.style.display = "";
hidden.style.position = "";
hidden.style.visibility = "";
assert_true(isFirstEvent, "Shouldn't get more than one scroll event");
isFirstEvent = false;
requestAnimationFrame(t.step_func(function() {
requestAnimationFrame(t.step_func_done(function() {
assert_equals(document.scrollingElement.scrollTop, targetScrollPosition);
}));
}));
});
window.onload = t.step_func(function() {
window.scrollTo(0, targetScrollPosition);
});
</script>