filter-lighting-region-ref.svg

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<!--

     Any copyright is dedicated to the Public Domain.

     http://creativecommons.org/publicdomain/zero/1.0/

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<svg xmlns="http://www.w3.org/2000/svg" width="600px" height="300px">

  <rect x="50" y="50" width="200" height="200" fill="black" />

  <rect x="340" y="40" width="220" height="220" fill="grey" />

  <rect x="350" y="50" width="200" height="200" fill="white" />

</svg>