XRWebGLLayer : XRLayer

Spec:
https://immersive-web.github.io/webxr/#xrwebgllayer-interface

----
new XRWebGLLayer(session : XRSession, gl : WebGLRenderingContext, [layerInit : { \
    antialias : Boolean /* Default = **true** */, \ 
    depth : Boolean /* Default = **true** */, \
    stencil : Boolean /* Default = **false** */, \
    alpha : Boolean /* Default = **true** */, \
    ignoreDepthValues : Boolean /* Default = **false** */, \
    framebufferScaleFactor : Number /* Default = **1.0** */ \
  }]) : XRWebGLLayer

----
instance.antialias : Boolean

ReadOnly:
true

----
instance.ignoreDepthValues : Boolean

ReadOnly:
true

----
instance.framebuffer : WebGLFramebuffer

ReadOnly:
true

----
instance.framebufferWidth : Number

ReadOnly:
true

----
instance.framebufferHeight : Number

ReadOnly:
true

----
prototype.getViewport(view : XRView) : XRViewport

----
getNativeFramebufferScaleFactor(session : XRSession) : Number

<htmlexample>
<script>
(async () => {
  const session = await navigator.xr.requestSession('inline');
  console.log(XRWebGLLayer.getNativeFramebufferScaleFactor(session));
})();
</script>
</htmlexample>