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chromium/third_party/blink/web_tests/editing/text-iterator/onbeforematch.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/whatwg/html/pull/7475#issuecomment-1068519935">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div id=target hidden=until-found>hello</div>

<script>
test(() => {
  let beforematchHandled = false;
  target.onbeforematch = () => beforematchHandled = true;
  testRunner.findString('hello', []);
  assert_true(beforematchHandled);
}, `Verifies that element.onbeforematch registers a beforematch event handler.`);
</script>