3D Retina Resolution Treat an explicit 200% rendering request as two drawing-buffer pixels per CSS pixel in each dimension. A 1200 × 800 CSS canvas therefore uses a 2400 × 1600 drawing buffer, or four times the pixels of 100%. Layout and camera framing stay unchanged. Choose the scale deliberately - Fixed 200%: effective pixel ratio is , independent of device pixel ratio. This is the default when the user explicitly requests 200%. - Automatic Retina, capped at 2×: effective ratio is . This can render at 1× on an ordinary display; label it Auto rather than claiming it always renders at 200%. -…