<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg"
     xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Reference for animation of the "elevation" attribute of the "feSpotLight" element</title>
  <defs>
    <filter id="f" x="0" y="0" width="0.5" height="0.5">
      <feSpecularLighting surfaceScale="5" specularConstant=".75"
                          specularExponent="20" lighting-color="lime">
        <feSpotLight x="0.25" y="0.25" z="100">
        </feSpotLight>
      </feSpecularLighting>
    </filter>
  </defs>
  <path d="M0,0 h100 v100 h-100 z" filter="url(#f)"/>
</svg>