encoding/utf-32.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>Character Decoding: UTF-32 (not supported) subresource of UTF-8 document</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<script>

// Since UTF-32 is not supported:
//  * HTML resources will use the parent encoding (UTF-8)
//  * XML resources will default to UTF-8
// ... except for the UTF-32LE-with-BOM case, where the UTF-32
// BOM will be mistaken for a UTF-16LE BOM (FF FE 00 00), in which
// case it will be interpreted as UTF-16LE.

const samples = [
  {file: 'resources/utf-32-big-endian-bom.html',
   characterSet: 'UTF-8',
   contentType: 'text/html'
  },
  {file: 'resources/utf-32-big-endian-bom.xml',
   characterSet: 'UTF-8',
   contentType: 'application/xml'
  },
  {file: 'resources/utf-32-big-endian-nobom.html',
   characterSet: 'UTF-8',
   contentType: 'text/html'
  },
  {file: 'resources/utf-32-big-endian-nobom.xml',
   characterSet: 'UTF-8',
   contentType: 'application/xml'
  },

  {file: 'resources/utf-32-little-endian-bom.html',
   characterSet: 'UTF-16LE',
   contentType: 'text/html'
  },
  {file: 'resources/utf-32-little-endian-bom.xml',
   characterSet: 'UTF-16LE',
   contentType: 'application/xml'
  },
  {file: 'resources/utf-32-little-endian-nobom.html',
   characterSet: 'UTF-8',
   contentType: 'text/html'
  },
  {file: 'resources/utf-32-little-endian-nobom.xml',
   characterSet: 'UTF-8',
   contentType: 'application/xml'
  }
];

samples.forEach(expected => async_test(t => {
  const iframe = document.createElement('iframe');
  iframe.src = expected.file;
  iframe.onload = t.step_func_done(() => {
    const doc = iframe.contentDocument;
    assert_equals(doc.contentType, expected.contentType);
    assert_equals(doc.characterSet, expected.characterSet);
    // The following is a little quirky as non-well-formed XML isn't defined in sufficient detail to
    // be able to use more precise assertions.
    assert_true(
      !('dataset' in doc.documentElement) ||
      doc.documentElement.dataset['parsed'] !== 'yes',
      'Should not have parsed as (X)HTML');
  });
  document.body.appendChild(iframe);
  t.add_cleanup(() => iframe.remove());
}, `Expect ${expected.file} to parse as ${expected.characterSet}`));

</script>
</body>