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A knockout group was written as a chain of soft masks, one inside the next for each element, so a group of about 200 elements made a PDF that VectorCraft's own PDF import refused (form nesting past 50) and an SVG that the web build refused as too deep. - PDF writes a knockout group as one transparency group with /K true, with /I true when the group isolates, and PDF import reads it back as a knockout group. An element with several paints is drawn as one group inside it, so its own fills and strokes do not knock each other out. - Where an element knocks out less than the area it paints (its opacity or mask defines its knockout shape, or it paints translucently), each element is drawn through one soft mask of the overlapping elements above it. Past 65,536 objects in a group's masks, or 2,048 elements, the group is a PDF knockout group, with a warning. - SVG draws each element through one mask of the overlapping elements above it, built from one shared copy of each element's shape, so the elements stay siblings. Past 65,536 shapes in a group's masks, or 2,048 elements, the group is written as a plain group, with a warning. Docs: docs/mcp.md, docs/target-app-parity.md.