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Opacity masks, inverted and unclipped masks, and knockout groups were written with mask and filter regions of 200,000 x 200,000 units around the origin. CairoSVG draws each mask into an image of its region's size and stops with "out of memory", so a file with any of them did not open; Firefox drew inverted masks wrong and WebKit drew knockout groups and inverted masks wrong. Each region now covers what the masked or knocked-out art paints: its visual box grown by its raster effects, brush art and members' reach, the mask art's box, and in a scaled symbol instance its strokes and effects at their own size. A mask whose art reaches past its object still comes back whole on import.