speculation-rules/prerender/resources/web-usb.https.html

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

const params = new URLSearchParams(location.search);

// The main test page (restriction-web-usb.https.html) loads the initiator
// page, then the initiator page will prerender itself with the `prerendering`
// parameter.
if (!params.has('prerendering')) {
  loadInitiatorPage();
} else {
  const prerenderEventCollector = new PrerenderEventCollector();
  prerenderEventCollector.start(
      navigator.usb.getDevices(), 'navigator.usb.getDevices');
}

</script>