<svg xmlns="http://www.w3.org/2000/svg">
<filter id="f1">
<feConvolveMatrix order="3" divisor="0" 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>