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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">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#FilterPrimitiveSubRegion">
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<p>Test passes if two semi-transparent green rectangles are on top of the
blue boxes to the left, and one opaque