<p><b>Note: </b>Internet Explorer and Safari do not support SVG filters yet!</p>
<svg xmlns="https://www.w3.org/2000/svg" version="1.1">
<filter id="f1" x="0" y="0" width="200%" height="200%">
<feOffset result="offOut" in="SourceGraphic" dx="20" dy="20" />
<feColorMatrix result = "matrixOut" in = "offOut" type = "matrix" values = "0.2 0 0 0 0 0 0.2 0 0 0 0 0 0.2 0 0 0 0 0 1 0"/>
<feGaussianBlur result="blurOut" in="matrixOut" stdDeviation="10" />
<feBlend in="SourceGraphic" in2="blurOut" mode="normal" />
<rect width="90" height="90" stroke="green" stroke-width="3" fill="yellow" filter="url(#f1)" />