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<!DOCTYPE html>
<html>
<body>
<svg style="display: block; width: 0; height: 0">
<defs>
<filter id="merge" primitiveUnits="objectBoundingBox">
<feMerge x="25%" y="25%" width="50%" height="50%">
<feMergeNode in="SourceGraphic"/>
<feMergeNode in="StrokePaint"/>
</feMerge>
</filter>
</defs>
</svg>
<canvas id="canvas" width="100" height="100"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.filter = 'url(#merge)';
ctx.strokeStyle = '#0f0';
ctx.arc(50, 50, 25, 0, Math.PI * 2, true);
ctx.fill();
</script>
</body>
</html>
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