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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
var a = document.getElementById("a");
var b = document.getElementById("b");
a.getContext('2d').createPattern(b, 'no-repeat');
}
</script>
</head>
<body onload="boom();">
<canvas id="a" width="61" height="26"></canvas>
<canvas id="b" width="611" height="439807"></canvas>
</body>
</html>