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<svg xmlns="http://www.w3.org/2000/svg" width="500" height="500">
<!-- It's unfortunately hard to reftest the extent of the blur. We can at
least make sure it paints *something* -->
<filter id="f1" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse">
<feGaussianBlur in="SourceGraphic" stdDeviation="10"/>
</filter>
<g filter="url(#f1)">
<rect x="100" y="100" width="100" height="100" fill="#00ff00"/>
</g>
<!-- the radius affected by the box-blur is bounded by 3 times the standard
deviation -->
<rect x="0" y="0" width="300" height="130" fill="#ffffff"/>
<rect x="0" y="130" width="130" height="40" fill="#ffffff"/>
<rect x="170" y="130" width="130" height="40" fill="#ffffff"/>
<rect x="0" y="170" width="300" height="130" fill="#ffffff"/>
<!-- we can test whether the blur is a reasonable size by bumping up
non-zero alpha values a lot -->
<filter id="f2" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse">
<feGaussianBlur in="SourceGraphic" stdDeviation="10"/>
<feComponentTransfer>
<feFuncA type="linear" slope="1000"/>
</feComponentTransfer>
</filter>
<g filter="url(#f2)">
<rect x="100" y="400" width="100" height="100" fill="#00ff00"/>
</g>
<!-- there should be nonzero alpha values everywhere within 1 standard
deviation of the original image -->
<rect x="0" y="300" width="300" height="90" fill="#ffffff"/>
<rect x="0" y="390" width="90" height="120" fill="#ffffff"/>
<rect x="210" y="390" width="90" height="120" fill="#ffffff"/>
<rect x="0" y="510" width="300" height="90" fill="#ffffff"/>
</svg>
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