from WebRender: When you run Servo with this command, you'll be looking at three things: CPU (backend): The amount of time WebRender is packing and batching data. CPU (Compositor): Amount of time WebRender an OpenGL implementation on top of Direct3D which is used in Servo to provide a consistent OpenGL backend on Windows-based platforms. How Servo's compositor starts The embedder is responsible for creating session from each of them. The discovery objects encapsulate creating a session for each supported backend. As of July 19, 2024, there are three WebXR backends: headless - supports a window-less, device-less