The read-only width property of the XRDepthInformation interface contains the width of the depth buffer (number of columns).

An unsigned long integer.

Use XRFrame.getDepthInformation() (CPU) or XRWebGLBinding.getDepthInformation() (WebGL) to obtain depth information. The returned objects will contain the width of the depth buffer, which you can use for further calculations.

const smallerDepthDimension = Math.min(depthInfo.width, depthInfo.height);
const largerDepthDimension = Math.max(depthInfo.width, depthInfo.height);