Yeah, D24S8 is the typical depth-stencil buffer format. That's also the most common format to have in your "default" framebuffer in OpenGL apps, but in this cas

Yeah, D24S8 is the typical depth-stencil buffer format. That's also the most common format to have in your "default" framebuffer in OpenGL apps, but in this case there might be some WebGL-specific limitations that the author wants to avoid. WebGL is still based on GLES 2.0 and if you go by the book, you probably need to account for a 16 bit D16 depth buffer without a stencil present. That's probably not a very common case in practice (except old mobiles), though....