File: sec-ch-width-auto-sizes-img.https.html

package info (click to toggle)
thunderbird 1%3A140.4.0esr-1
  • links: PTS, VCS
  • area: main
  • in suites: forky
  • size: 4,609,432 kB
  • sloc: cpp: 7,672,442; javascript: 5,901,613; ansic: 3,898,954; python: 1,413,343; xml: 653,997; asm: 462,286; java: 180,927; sh: 113,489; makefile: 20,460; perl: 14,288; objc: 13,059; yacc: 4,583; pascal: 3,352; lex: 1,720; ruby: 1,222; exp: 762; sql: 715; awk: 580; php: 436; lisp: 430; sed: 70; csh: 10
file content (34 lines) | stat: -rw-r--r-- 1,122 bytes parent folder | download | duplicates (14) 
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
 
<!DOCTYPE html>
<meta charset="utf-8">
<meta http-equiv="Delegate-CH" content="Sec-CH-Width">
<title>Tests Sec-CH-Width with auto sizes</title>
<link rel="help" href="https://wicg.github.io/responsive-image-client-hints/#sec-ch-width">
<link rel="help" href="https://html.spec.whatwg.org/#sizes-attributes">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
  setup({explicit_done: true});

  function run() {
    test(() => {
      const testImage = document.getElementsByTagName('img')[0];
      // Spec: sec-ch-width MUST be an integer greater than or equal to 0.
      const width = Math.ceil(50 * devicePixelRatio);
      assert_equals(testImage.naturalWidth, 2 * width);
      assert_equals(testImage.naturalHeight, 3 * width);
    }, 'Sec-CH-Width is set for lazy auto sizes');
    done();
  }
</script>

<div style="width: 100px; height: 100px;">
  <img
    onload="run()"
    loading="lazy"
    sizes="auto"
    srcset="resources/2x3-svg-scaled-by-sec-ch-width.py 50w"
    width="300"
    height="300"
    style="width: 50%; height: 50%;">
</div>