absolute;">
  <canvas id="canvas" width="500" height="400" style="width: 500px; height: 400px;"></canvas>
</div>
<div id="uiContainer">
  <div id="ui">
    <div id="rotation"></div>
  </div>
</div>
</body>
<!--
for most samples webgl-utils only provides shader compiling/linking and
canvas resizing because why clutter the examples with code that's the same in every sample.
See https://webgl2fundamentals.org/webgl/lessons/webgl-boilerplate.html
and https://webgl2fundamentals.org/webgl/lessons/webgl-resizing-t