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chromium/third_party/blink/web_tests/external/wpt/shadow-dom/historical.html 

<!doctype html>
<title>Shadow DOM v0 features should NOT be present</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
test(() => {
  assert_false('createShadowRoot' in Element.prototype)
}, 'element.createShadowRoot should not exist')

test(() => {
  assert_false('getDestinationInsertionPoints' in Element.prototype)
}, 'element.getDestinationInsertionPoints should not exist')

test(() => {
  assert_false('getDestinationInsertionPoints' in Text.prototype)
}, 'text.getDestinationInsertionPoints should not exist')

test(() => {
  assert_false('path' in Event.prototype)
}, 'event.path should not exist')

test(() => {
  assert_false('HTMLContentElement' in window)
}, 'HTMLContentElement should not exist')
</script>