<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom() {
var canvas = document.createElement('canvas');
var ctx = canvas.getContext('2d');
ctx.mozCurrentTransformInverse = [32, -1, 0.8320478957221024, 1.7976931348623157e+308, 512, 0.9012573524148337];
ctx.fillText("A", 0 ,0);
}
</script>
</head>
<body onload="boom();"></body>
</html>