test/SVG/rad-gradient.xml

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG April 1999//EN" 
  "http://www.w3.org/Graphics/SVG/svg-19990412.dtd">
<svg width="4in" height="3in">
  <desc>Radial gradient example with three gradient stops
  </desc>
  <g>
    <defs>
      <radialgradient id="MyGradient">
         <gradientstop offset="0%" color="white"/>
         <gradientstop offset="50%" color="red"/>
         <gradientstop offset="100%" color="black"/>
      </radialgradient>
    </defs>
    <circle style="fill: url(#MyGradient)" r="42"/>
  </g>
</svg>