Here's my index.html

<style>
body {
    margin: 0;
    background-color: black;
}

</style>
<canvas></canvas>
<script src="index.js"></script>

here's my version of Java:

java version "21.0.2" 2024-01-16 LTS

Java(TM) SE Runtime Environment (build 21.0.2+13-LTS-58)

Java HotSpot(TM) 64-Bit Server VM (build 21.0.2+13-LTS-58, mixed mode, sharing)

running on Ubuntu Desktop:

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 22.04.4 LTS

Release: 22.04

Codename: jammy

I figured it out....I had "position" spelled wrong. Line 53 "postion' .. dumbass! :-)