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HQ tiles are 512px and the atlas stays at 4096² (64 full-size slots). Browser zoom plus a forced ?dpr= can need more visible tiles than that, and a framebuffer larger than the GPU allows. Pack interest tiles into smaller atlas cells, blit at 512 then scale, and inset Linear samples so seams do not bleed. Clamp the canvas backing store and DPR together, wrap Skia at the real drawingBuffer size, and wait one frame after DPR changes so CSS client size and overlays stay aligned.