File: revert-layer-008.html

package info (click to toggle)
firefox-esr 140.4.0esr-1~deb13u1
  • links: PTS, VCS
  • area: main
  • in suites: trixie-proposed-updates
  • size: 4,539,284 kB
  • sloc: cpp: 7,381,286; javascript: 6,388,710; ansic: 3,710,139; python: 1,393,780; xml: 628,165; asm: 426,916; java: 184,004; sh: 65,742; makefile: 19,302; objc: 13,059; perl: 12,912; yacc: 4,583; cs: 3,846; pascal: 3,352; lex: 1,720; ruby: 1,226; exp: 762; php: 436; lisp: 258; awk: 247; sql: 66; sed: 54; csh: 10
file content (43 lines) | stat: -rw-r--r-- 1,110 bytes parent folder | download | duplicates (16) 
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
 
<!DOCTYPE html>
<title>CSS Cascade Layers: 'revert-layer' triggers a smooth transition</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#revert-layer">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
@layer revert-to, revert-from;

@layer revert-from {
  #target {
    font-size: 10px;
    transition: font-size 2s linear -1s;
  }

  #target.reverted {
    font-size: revert-layer;
  }
}

@layer revert-to {
  #target { font-size: 20px; }
}
</style>

<div id="target"></div>

<script>
function raf() {
  return new Promise(resolve => requestAnimationFrame(resolve));
}
promise_test(async () => {
  const target = document.getElementById('target');
  getComputedStyle(target).getPropertyValue('font-size');

  await raf();
  target.classList.toggle('reverted');

  const result = getComputedStyle(target).getPropertyValue('font-size');
  assert_equals(result, '15px');
}, "'revert-layer' should revert font-size to 20px and trigger a smooth transition");
</script>