gecko-dev/dom/canvas/test/reftest/mozCurrentTransformInverse....

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HTML

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<canvas id="canvas" width="150" height="150"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.transform(1,0.5,-0.5,1,30,10);
setTimeout(function() {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var transform = ctx.mozCurrentTransformInverse;
ctx.mozCurrentTransformInverse = transform;
ctx.fillStyle = '#f00';
ctx.fillRect(0, 0, 100, 100);
document.documentElement.removeAttribute("class");
}, 10)
</script>
</body></html>