third_party/WebKit/LayoutTests/external/wpt/feature-policy/resources/feature-policy-webvr.html

<script>
'use strict';

Promise.resolve().then(() => navigator.getVRDisplays()).then(displays => {
  window.parent.postMessage({ enabled: true }, '*');
}, error => {
  window.parent.postMessage({ enabled: false }, '*');
});
</script>