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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/bluetooth-access.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-bluetooth.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();
  // The spec, https://wicg.github.io/nav-speculation/prerendering.html#web-bluetooth-patch,
  // mentions getDevices() and requestDevice() but this test uses
  // getAvailability() instead of them.
  prerenderEventCollector.start(navigator.bluetooth.getAvailability(),
                                'navigator.bluetooth.getAvailability');
}

</script>