Shows how to request 72hz rendering on the Go. Can be combined with samples at https://webvr.info/samples/

RequestHighestRefreshRate.js

// This is connected to your "Enter WebVR" button
function onVRRequestPresent () {
  console.log("onVRRequestPresent begin");
  // This can only be called in response to a user gesture.
  var attributes = {
    highRefreshRate: true,
  };
  vrDisplay.requestPresent([{source: webglCanvas, attributes: attributes}]).then(function () {
    // Nothing to do because we're handling things in onVRPresentChange.
    console.log("highRefreshRate = " + vrDisplay.getLayers()[0].attributes.highRefreshRate);
  }, function (err) {
    var errMsg = "requestPresent failed.";
    if (err && err.message) {
      errMsg += "<br/>" + err.message
    }
    VRSamplesUtil.addError(errMsg, 2000);
    console.log("onVRRequestPresent: errMsg");
  });
  console.log("onVRRequestPresent end");
}