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<title>filter primitive subregion: Clip to filter primitive subregion</title>
<link rel="author" title="Chris Lilley" href="mailto:chris@w3.org">
<p>Test passes if two semi-transparent green rectangles are on top of the
blue boxes to the left, and one opaque green rectangle on the blue box
to the right.</p>
<!-- this is example filtersubregion00 from the specification -->
<img src="support/filtersubregion00.png" style="width:400px; height: 400px"/>
