Why are there different versions of webgl?

Question

JavaScript

Wrote code based on the book by Koichi Matsuda and Roger Lee - webgl 3D programming - single webgl - https://sites.google.com/site/webglbook/

<script src="http://rodger.global-linguist.com/webgl/lib/webgl-utils.js">

I found an article on habré about webl there is another webl https://webglfundamentals.org/webgl/lessons/ru/

<script src="https://webglfundamentals.org/webgl/resources/webgl-utils.js">

In general, incompatible js libraries in one do not have functions from the other.
javascript guru explain

Answer 1

WebGL