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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<canvas id="canvas0"></canvas>
<script>
var canvas0=document.getElementById("canvas0");
var ctx=canvas0.getContext("2d");
canvas0.addEventListener("DOMAttrModified",
function(event) {
canvas0.toBlob(function(){},"image/jpeg",1);
}, true);
canvas0.setAttribute("height",470)
</script>
</body>
</html>
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