WebSockets. URL: https://websockets.spec.whatwg.org/.
1\] WebRTC: Real-time communication in browsers. URL: https://www.w3. org/TR/webrtc/ \[1\] WebXR device API. URL: [WebXR Device API](https://immersive-web.github.io/webxr/ "WebXR Device API"); WebXR hand input module. URL: https://www.w3.org/TR/webxr-handinput-1/. \[1\] Spatial Anchors. \[Online\]. Available: https://azure.microsoft.com/en-us/products/spatial-anchors.