="100" fx="370" fy="44" fr="10">
    </radialGradient>
  </defs>
  <rect x="0" y="0" width="400" height="300" fill="url(#test1)"></rect>
</svg>
<svg width="400" height="300" version="1.1" xmlns="http://www.w3.org/2000/svg">
  <defs>
  <!-- Start circle radius == end circle radius -->
  <radialGradient href="#baseGrad" id="test2" gradientUnits="userSpaceOnUse" cx="200" cy="150" r="10" fx="40" fy="225" fr="10">
    </radialGradient>
  </defs>
  <rect x="0" y="0" width="400" height="300" fill="url(#test2)"></r