@karelpeeters there is something similar

What?

you asked me

Is there a 'GLES20' with a 'glVertexAttribPointer' on JS?

Ah okay, that was a while ago with some stuff in between.

I need to study how webGL works, but for know I would like to know if I can create a script with macros that does different calls based on what compiler it uses. (one part of the source for JVM and another for JS).

Yeah you can definitely do that, use

expect

and `actual`: https://kotlinlang.org/docs/reference/multiplatform.html#platform-specific-declarations