<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>canvas</title>
  </head>
  <body>
    <canvas
      id="myCanvas"
      width="200"
      height="100"
      style="border: 1px solid #000000"
    >
    </canvas>
    <script>
      setTimeout(() => {
        const c = document.getElementById('myCanvas');
        const ctx = c.getContext('webgl');
        // Set clear color to red, fully opaque
      