gecko-dev/dom/canvas/test/test_toBlob_zero_dimension....

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HTML

<!DOCTYPE HTML>
<title>Canvas test: toBlob</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body>
<canvas id="c" width="100" height="0"></canvas>
<script>
function testblob(blob) {
is(blob, null, "Null blob expected");
}
function test1(canvas)
{
canvas.toBlob(function(blob) {
testblob(blob);
test2(canvas);
}, "image/png");
}
function test2(canvas)
{
canvas.width = 0;
canvas.height = 100;
canvas.toBlob(function(blob) {
testblob(blob);
SimpleTest.finish();
}, "image/png");
}
SimpleTest.waitForExplicitFinish();
addLoadEvent(function () {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
test1(canvas);
});
</script>