imagedecoder-animation.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:
- /jpegxl/imagedecoder-animation.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>JPEG XL: animation basics via ImageDecoder</title>

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

<meta name="assert" content="ImageDecoder reports animation track and decodes multiple frames.">

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

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

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

<script>

promise_test(async () => {

  assert_implements('ImageDecoder' in self, 'ImageDecoder should exist');

  const supported = await ImageDecoder.isTypeSupported('image/jxl');

  assert_true(supported, 'image/jxl should be supported');

  const response = await fetch('resources/conformance_animation_spline.jxl');

  const decoder = new ImageDecoder({data: response.body, type: 'image/jxl'});

  await decoder.tracks.ready;

  const track = decoder.tracks.selectedTrack;

  assert_true(track.animated, 'track must be animated');

  assert_greater_than(track.frameCount, 1, 'must expose multiple frames');

  const f0 = await decoder.decode({frameIndex: 0});

  const f1 = await decoder.decode({frameIndex: 1});

  assert_less_than(f0.image.timestamp, f1.image.timestamp,

      'timestamps should increase');

  f0.image.close();

  f1.image.close();

  decoder.close();

}, 'Animated JPEG XL reports multiple frames and decodes frame sequence.');

</script>