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`BackgroundImage`, `BackgroundAlpha`, `FillPaint` and `StrokePaint` in SVG filters
The SVG spec includes special keywords that can be used inside an SVG filter to access parts of the element rendering. Those are: SourceGraphic, SourceAlpha, BackgroundImage, BackgroundAlpha, FillPaint and StrokePaint. The first two are universally supported because they were available in SVG 1. The newer SVG 2 introduces the others, so in many cases, browser implementations lag behind.