<!DOCTYPE html>
<p>Expect a black square with a soft red shadow below this text.</p>
<canvas id='c' width='100' height='100' style="box-shadow: 5px 10px 0px rgba(255,0,0,0.4);"></canvas>
<script>
var canvas = document.getElementById('c');
var gl = canvas.getContext('webgl', {alpha:false});
</script>