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<!--
Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg" width="600px" height="300px">
<!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=1203376 -->
<defs>
<!-- the filter lights are intentionally chosen to fill the entire area with
a solid color since we're only testing the extents of the filter region
-->
<filter id="diffuse" x="-50%" y="-50%" width="200%" height="200%">
<!-- gives a black filter region -->
<feDiffuseLighting lighting-color="black">
<feDistantLight />
</feDiffuseLighting>
</filter>
<filter id="specular" x="-50%" y="-50%" width="200%" height="200%">
<!-- gives a white filter region -->
<feSpecularLighting lighting-color="white" specularConstant="100">
<feDistantLight elevation="90"/>
</feSpecularLighting>
</filter>
</defs>
<rect x="100" y="100" width="100" height="100" filter="url(#diffuse)" />
<rect x="340" y="40" width="220" height="220" fill="grey" />
<rect x="400" y="100" width="100" height="100" filter="url(#specular)" />
</svg>
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