<!DOCTYPE html>
<meta charset="utf-8">
<title>href - gradient element reference</title>
<body>
  <svg width="300" height="300" viewBox="0 0 300 300"
       xmlns:xlink="http://www.w3.org/1999/xlink">
    <linearGradient id="MyGradient">
      <stop offset="5%"  stop-color="green"/>
      <stop offset="95%" stop-color="gold"/>
    </linearGradient>
    <rect fill="url(#MyGradient)" stroke="black" x="0" y="0"
          width="100" height="100"/>

    <radialGradient id="MyRadialGradient">
      <stop offset="0%" stop-color="red"/>
      <stop offset="100%" stop-color="blue"/>
    </radialGradient>
    <rect x="110" y="0" rx="15" ry="15" width="100" height="100"
          fill="url(#MyRadialGradient)"/>
  </svg>
</body>