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chromium/third_party/blink/web_tests/accessibility/shadow-dom-detached-crash.html 

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

<script>
test(() => {
  var bar = document.createElement("div");
  var shadowRoot = bar.attachShadow({mode: 'open'});
  bar.computedName;
}, "No crash when getting computed name from a node with a shadow root not attached to a document");

test(() => {
  var bar = document.createElement("div");
  var shadowRoot = bar.attachShadow({mode: 'open'});
  bar.computedRole;
}, "No crash when getting computed role from a node with a shadow root not attached to a document");

</script>