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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/speculation-rules/prerender/resources/utils.js"></script>
<script>

assert_true(document.prerendering);

const params = new URLSearchParams(location.search);
const uid = params.get('uid');

async function showFilePicker(){
  const bc = new PrerenderChannel('prerender-channel', uid);

  try {
    const _ = await window.showOpenFilePicker()
    bc.postMessage('unexpected success');
  } catch (err){
    bc.postMessage(err.name);
  } finally {
    bc.close();
  }
}

showFilePicker();

</script>