The Architecture of CSS Color Module Level 4
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The provided documents detail the transition of CSS Color Module Level 4 from a simple collection of sRGB values into a sophisticated, high-precision color management system. This specification modernizes web design by introducing perceptual color spaces like Oklab and OkLCh, which ensure visually consistent gradients and predictable interpolation. It establishes a rigorous rendering pipeline that handles complex tasks such as white-point adaptation, linear-light conversion, and gamut mapping for wide-gamut displays. While Level 4 provides the foundational machinery for color representation and hardware compatibility, it explicitly leaves advanced functions like color-mixing and relative syntax to the subsequent Level 5 draft. Furthermore, the text distinguishes between legacy sRGB syntax and modern space-separated functions, introducing the none keyword to handle missing color components semantically during interpolation. Ultimately, these sources frame the update as a shift from basic styling to a device-independent model that prioritizes human perception and cross-platform interoperability.
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