gecko-dev/layout/reftests/canvas/size-change-1.html

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HTML

<!DOCTYPE html>
<html class="reftest-wait">
<body>
<canvas width="100" height="100" id="c"></canvas>
<script>
var c = document.getElementById("c");
var ctx = c.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(0,0,100,100);
function finishTest() {
c.width = 200;
c.height = 200;
ctx.fillStyle = "lime";
ctx.fillRect(0,0,200,200);
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", finishTest);
</script>
</body>
</html>