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

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

promise_test(async _ => {
  const promise = new Promise(
      resolve => mockFileChooserFactory.addEventListener('open', resolve));

  const file = document.querySelector('input');
  file.focus();
  // Despite the name, 'keyDown' simulates a full down/press/up sequence.
  eventSender.keyDown('Enter', []);

  const openEvent = await promise;
  assert_equals(openEvent.detail, 'kOpen');
}, 'pressing Enter key with focus on a file input launches a file chooser');
</script>