One-page reference: the compositing 'over' formula with a worked example; why replacement looks faker than blur (the three seams and their fixes — feather/alpha matte, colour-match/light wrapping, spill suppression); the green-screen chroma-key decision; Zoom and Teams background-asset specs; and the browser build-it-yourself checklist (raw-frame access, GPU composite, upload-once texture, mirror, feather, close every frame).
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