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chromium/third_party/blink/web_tests/external/wpt/fenced-frame/show-open-file-picker.https.html 

<!DOCTYPE html>
<title>showOpenFilePicker API test</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/utils.js"></script>
<script src="/common/utils.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/resources/testdriver-actions.js"></script>

<body>
<script>
promise_test(async () => {
  const frame = attachFencedFrameContext();
  const result = await frame.execute(async () => {
    await simulateGesture();
    try {
      const dir = await window.showOpenFilePicker();
      return 'opened file picker';
    } catch (e) {
      if (e.name === 'SecurityError' &&
          e.message === "Failed to execute 'showOpenFilePicker' on 'Window': Cross origin sub frames aren't allowed to show a file picker.") {
        return 'Access to the open file picker was disallowed';
      }
      return `showOpenFilePicker failed with unknown error ${e.name} ${e.message}`;
    }
  });
  assert_equals(result, 'Access to the open file picker was disallowed');
}, 'Directory information should not be read in the fenced frame.');
</script>
</body>