<div id="ui">
    <div id="x"></div>
    <div id="y"></div>
    <div id="angle"></div>
    <div id="scaleX"></div>
    <div id="scaleY"></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-the-canvas.html
for webgl-utils, m3, m4,