title: How to set highRefreshRate in WebXR?
body: <p>For WebVR I've found: vrDisplay.requestPresent ([{source: canvas, attributes: {highRefreshRate: true}}]);</p>
  
  <p>For WebXR only: requiredFeatures: ["local-floor"]</p>
  
  <p>For requiredFeatures: ["highRefreshRate"]. I get "Unrecognized feature requested: highRefreshRate" Error in Oculus Go. Can I get supported features?</p>
  
  <p>and how to set 'foveationLevel: 3'?</p>