The CanvasItem shader reference mentions a non-existent DEPTH constant

[robbertzzz]

Your Godot version:
4.2 stable

Issue description:
The documentation for CanvasItem shaders contains the following sentence twice: "xy specifies position in window, z specifies fragment depth if DEPTH is not used". However, this DEPTH constant does not exist. Both occurences are in the description of FRAGCOORD for the fragment shader and light shader respectively.

URL to the documentation page:
https://docs.godotengine.org/en/stable/tutorials/shaders/shader_reference/canvas_item_shader.html

[AThousandShips]

Probably a copy/paste error from the spatial shader

[clayjohn]

Ya the mention of DEPTH can just be removed

[robbertzzz]

Most likely related, I don't think FRAGCOORD.z contains any useful values in 2D either. I'd propose removing everything after the comma in my quote.