three.js is a quite robust WebGL framework. I'll let JS Magic Leap be your homework.

Sometimes libraries and frameworks make our lives easier. I'm glad the tools exist. I had much more fun writing all the little systems that go into a working WebGL app, and working with WebGL API directly, than using any of the popular libraries. But good luck teaching any meaningful amount of WebGL to a group of students who don't even know what HTML stands for without a library like three.js