<html>
<body>
<p><b>Note: </b>Internet Explorer and Safari do not support SVG filters yet!</p>
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<defs>
<filter id="f1" x="0" y="0" width="200%" height="200%">
<feoffset result="offOut" in="SourceGraphic" dx="20" dy="20"></feoffset>
<fegaussianblur result="blurOut" in="offOut" stddeviation="10"></fegaussianblur>
<feblend in="SourceGraphic" in2="blurOut" mode="normal"></feblend>
</filter>
</defs>
<rect width="90" height="90" stroke="green" stroke-width="3" fill="yellow" filter="url(#f1)"></rect>
</svg>
</body>
</html>