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chromium/third_party/blink/web_tests/external/wpt/html/semantics/document-metadata/the-link-element/link-rellist.html 

<!DOCTYPE html>
<title>link.relList: non-string contains</title>
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-link-element">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#domtokenlist">
<link rel="help" href="https://webidl.spec.whatwg.org/#ecmascript-binding">
<link rel="help" href="http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf#page=57">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link id="link" rel="undefined null 0 NaN Infinity">
<div id="log"></div>
<script>
test(function() {
  var list = document.getElementById("link").relList;
  assert_equals(list.contains(undefined), true); //"undefined"
  assert_equals(list.contains(null), true); //"null"
  assert_equals(list.contains(-0), true); //"0"
  assert_equals(list.contains(+0), true); //"0"
  assert_equals(list.contains(NaN), true); //"NaN"
  assert_equals(list.contains(+Infinity), true); //"Infinity"
  assert_equals(list.contains(-Infinity), false); //"-Infinity"
  assert_equals(list.supports("stylesheet"), true);
  assert_equals(list.supports("nosuchrelvalueever"), false);
});
</script>