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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/resources/web-xr-inline-session.https.html 

<!DOCTYPE html>
<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>

// The main test page (restriction-web-xr-inline-session.https.html) loads the
// initiator page, then the initiator page will prerender itself with the
// `prerendering` parameter.
const params = new URLSearchParams(location.search);
const isPrerendering = params.has('prerendering');

if (!isPrerendering) {
  const rule_extras = {'target_hint': getTargetHint()};
  loadInitiatorPage(rule_extras);
} else {
  const prerenderEventCollector = new PrerenderEventCollector();
  prerenderEventCollector.start(
      navigator.xr.requestSession('inline'),
      `XRSession.requestSession('inline')`);
}

</script>