gecko-dev/dom/canvas/crashtests/1549853.html

<canvas id='a' height='67108864' width='80'></canvas>
<script>
document.addEventListener("DOMContentLoaded", function() {
  var c=document.getElementById('a')
  var x=c.getContext('2d', {alpha: true})
  c.setAttribute('width', 800)
})
</script>