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chromium/third_party/blink/web_tests/fast/dom/shadow/link-without-rel-crash.html 

<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script>

let t = async_test('Setting rel=stylesheet on link in shadow root does not crash');

function run() {
  t.step(() => {
    let link = document.createElement('link');
    link.setAttribute('href', 'empty.css');
    let div = document.createElement('div');
    let shadowRoot = div.attachShadow({mode: 'open'});
    document.body.append(div);
    shadowRoot.append(link);
    link.setAttribute('rel','stylesheet');
  });
  t.done();
}

</script>
<body onload="run()"></body>