This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
var myImmediatePose = vrDisplayInstance.getImmediatePose();
The definition of 'getImmediatePose()' in that specification.
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||IE mobile||Opera Android||iOS Safari|
1. Windows support was enabled in Firefox 55.
2. macOS support was enabled in Firefox 58.