<!DOCTYPE html>
<html>
<body>
<p><strong>Note:</strong> Internet Explorer 9 and earlier versions do not support SVG filters.</p>
<svg height="140" width="140">
<defs>
<filter id="f1" x="0" y="0" width="200%" height="200%">
<feOffset result="offOut" in="SourceAlpha" dx="20" dy="20" />
<feGaussianBlur result="blurOut" in="offOut" stdDeviation="10" />
<feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
</filter>
</defs>
<rect width="90" height="90" stroke="green" stroke-width="3" fill="yellow" filter="url(#f1)" />
Sorry, your browser does not support inline SVG.
</svg>
</body>
</html>