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chromium/third_party/blink/web_tests/external/wpt/xhr/historical.html 

<!doctype html>
<meta charset="utf-8">
<title>Historical features</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
["moz-blob", "moz-chunked-text", "moz-chunked-arraybuffer"].forEach(function(rt) {
  test(function() {
    var xhr = new XMLHttpRequest();
    xhr.responseType = rt;
    assert_equals(xhr.responseType, "");
  }, "Support for responseType = " + rt);
});
</script>