alpha-vardct.html - mozsearch

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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:
- /jpegxl/alpha-vardct.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>JPEG XL: alpha with VarDCT-oriented fixture</title>

<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">

<meta name="assert" content="Decodes alpha-bearing fixture and verifies transparency exists.">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/helpers.js"></script>

<script>

promise_test(async () => {

  const img = await loadImage('resources/conformance_alpha_nonpremultiplied.jxl');

  const px = samplePixel(img, 10, 10);

  assert_less_than(px[3], 255, 'fixture should include transparent pixels');

}, 'Alpha channel is preserved for high bit-depth fixture.');

</script>