File: abspos-contributes-to-static-parent-bounds.html

package info (click to toggle)
thunderbird 1%3A91.13.0-1~deb11u1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 2,953,400 kB
  • sloc: cpp: 6,084,049; javascript: 4,790,441; ansic: 3,341,496; python: 862,958; asm: 366,542; xml: 204,277; java: 152,477; sh: 111,436; makefile: 21,388; perl: 15,312; yacc: 4,583; objc: 3,026; lex: 1,720; exp: 762; pascal: 635; awk: 564; sql: 453; php: 436; lisp: 432; ruby: 99; sed: 69; csh: 45
file content (40 lines) | stat: -rw-r--r-- 907 bytes parent folder | download | duplicates (20) 
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
 
<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>

body, html, #static { height: 0; }
#abs {
  position: absolute;
  left: 50px;
  top: 50px;
  height: 1200px;
  padding: 50px;
  border: 5px solid gray;
}
#anchor {
  background-color: #afa;
  width: 100px;
  height: 100px;
}

</style>
<div id="static">
  <div id="abs">
    <div id="changer"></div>
    <div id="anchor"></div>
  </div>
</div>
<script>

// Tests that the "bounds" of an element, for the purpose of visibility in the
// anchor node selection algorithm, include any space occupied by the element's
// positioned descendants.

test(() => {
  document.scrollingElement.scrollTop = 120;
  document.querySelector("#changer").style.height = "100px";
  assert_equals(document.scrollingElement.scrollTop, 220);
}, "Abs-pos with zero-height static parent.");

</script>