File: clip-negative-bottom-margin.html

package info (click to toggle)
thunderbird 1%3A143.0.1-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 4,703,968 kB
  • sloc: cpp: 7,770,492; javascript: 5,943,842; ansic: 3,918,754; python: 1,418,263; xml: 653,354; asm: 474,045; java: 183,079; sh: 111,238; makefile: 20,410; perl: 14,359; objc: 13,059; yacc: 4,583; pascal: 3,405; lex: 1,720; ruby: 999; exp: 762; sql: 715; awk: 580; php: 436; lisp: 430; sed: 69; csh: 10
file content (36 lines) | stat: -rw-r--r-- 1,020 bytes parent folder | download | duplicates (27) 
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
 
<!DOCTYPE html>
<title>Layout Instability: clip with negative bottom margin</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>

#scroller { overflow: scroll; width: 200px; height: 500px; }
#space { height: 1000px; margin-bottom: -500px; }
#j { width: 150px; height: 150px; background: yellow; }

</style>
<div id='scroller'>
  <div id='space'></div>
  <div id='j'></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);

  // Increase j's top margin by 100px. Since j is fully clipped by the scroller,
  // this should not generate a shift.
  document.querySelector("#j").style.marginTop = "100px";

  await waitForAnimationFrames(3);
  assert_equals(watcher.score, 0);
}, "Clip with negative bottom margin.");

</script>