jpegxl/lossless-jpeg-transcode.html

<!DOCTYPE html>
<title>JPEG XL: lossless JPEG transcode decode</title>
<link rel="help" href="https://github.com/web-platform-tests/interop-jpegxl">
<meta name="assert" content="Decodes JPEG-reconstruction-capable JPEG XL fixture.">
<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/3x3_jpeg_recompression.jxl');
  assert_equals(img.naturalWidth, 3);
  assert_equals(img.naturalHeight, 3);
}, 'Lossless JPEG-transcoded JPEG XL fixture decodes.');

</script>