JSFiddle - React, Tailwind, and code Playground

HTML

<canvas id="one"></canvas>
<canvas id="two"></canvas>

JavaScript

var one = document.getElementById("one").getContext("bitmaprenderer"); 
var two = document.getElementById("two").getContext("bitmaprenderer");

var offscreen = new OffscreenCanvas(256, 256); //<<ERROR
var gl = console.log(offscreen.getContext('webgl'));