sec-ch-width-auto-sizes-picture.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /client-hints/sec-ch-width-auto-sizes-picture.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<meta http-equiv="Delegate-CH" content="Sec-CH-Width">

<title>Tests Sec-CH-Width with auto sizes and picture</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>

<picture>

  <source

    srcset="resources/2x3-svg-scaled-by-sec-ch-width.py 50w"

    sizes="auto"

    width="100"

    height="100">

  <img

    onload="run()"

    loading="lazy"

    sizes="auto"

    src="fail.png"

    width="100"

    height="100"

    style="width: 50px; height: 50px;">

</picture>