<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg width="100%" height="100%"
  viewBox="0 0 480 360" xmlns="http://www.w3.org/2000/svg"
  xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Reference for objectBoundingBox with fePointLight</title>
  <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=619992 -->

  <defs>
    <filter id="f" primitiveUnits="objectBoundingBox">
      <feSpecularLighting lighting-color="blue" surfaceScale="5" specularConstant="10" specularExponent="6">
        <fePointLight x="0.875" y="0.875" z="-0.0625"/>
      </feSpecularLighting>
    </filter>
  </defs>

  <g transform="translate(50 50)">
    <rect x="-40" y="-40" width="80" height="80" filter="url(#f)" fill="none"/>
  </g>
</svg>