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

An unsigned long integer.

Use XRFrame.getDepthInformation() (CPU) or XRWebGLBinding.getDepthInformation() (WebGL) to obtain depth information. The returned objects will contain the height 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);