file-input-webkitdirectory-key-enter-prevent-keyup.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<title>INPUT TYPE=FILE WEBKITDIRECTORY and key events - Enter keyup prevented</title>
<input type="file" webkitdirectory>
<script type="module">
import {mockFileChooserFactory} from '../resources/mock-file-chooser.js';

promise_test(_ => {
  const promise = new Promise((resolve, reject) => {
    mockFileChooserFactory.addEventListener(
        'open', () => reject('chooser opened unexpectedly'));
    setTimeout(resolve, 10);
  });

  const input = document.querySelector('input');
  input.onkeyup = e => e.preventDefault();
  input.focus();
  // Despite the name, 'keyDown' simulates a full down/press/up sequence.
  eventSender.keyDown('Enter', []);
  return promise;
}, 'pressing Enter on a focused webkitdirectory file input does not show a chooser if keyup on the element is handled with preventDefault()');
</script>

chromium/third_party/blink/web_tests/wpt_internal/forms/file/file-input-webkitdirectory-key-enter-prevent-keyup.html