Render-Diffing SVGs After Optimization Catches Invisible Rendering Bugs

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SVG optimizers like SVGO promise smaller file sizes but not pixel-perfect rendering fidelity, meaning edge cases can silently alter how icons look. A path may be rewritten into a mathematically equivalent form that renders differently at certain sizes or in specific renderers. Developer advocates suggest a render-diff approach: rasterize both the original and optimized SVG, then compare the two bitmaps pixel-by-pixel against a small tolerance threshold. If the images diverge beyond that tolerance, the optimized version is discarded in favor of the original. This automated check shifts the guarantee from trusting that transforms are safe to verifying that the actual rendered output is unchanged.

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