<svg xmlns="http://www.w3.org/2000/svg">
  <filter id="f1">
    <feConvolveMatrix order="3" targetX="4" kernelMatrix="0 1 0   1 1 1   0 1 0"/>
  </filter>
  <text x="20" y="20">Test PASSES if it does not crash and has no red rectangle.</text>
  <g filter="url(#f1)">
    <rect x="0" y="0" width="50" height="50" fill="red" />
  </g>
</svg>