If I am not wrong, there is no working gl_FragDepth in WebGL now. GLSL spec has it.
Is it just temporary?
What if I would like to count depth per-pixel? Is there any other way?

It’s not present in OpenGL ES 2.0 - so WebGL doesn’t have it. … .10.11.pdf


The output variables gl_ClipVertex and gl_FragDepth are removed.

– Steve