Browser 38.1 が、配信開始されました。
Access to the Avatar Selfie Camera when using the camera on websites、WebXR: support for general texture foveation (https://immersive-web.github.io/layers/#dom-xrwebglbinding-foveateboundtexture)、WebXR: Support for EXT_clip_control (https://registry.khronos.org/webgl/extensions/EXT_clip_control/)、など。
https://developers.meta.com/horizon/documentation/web/browser-release-notes/?locale=en_US#browser-381