The XRCylinderLayer interface of the WebXR Device API is a layer that takes up a curved rectangular space in the virtual environment. Only the front of the layer is visible.
A number indicating the ratio of the visible cylinder section. It is the ratio of the width of the visible section of the cylinder divided by its height. The width is calculated by multiplying the radius with the centralAngle.
Sent to the XRCylinderLayer object when the underlying resources of the layer are lost or when the XR Compositor can no longer reproject the layer. If this event is sent, authors should redraw the content of the layer in the next XR animation frame.