Blink Style Engine Architecture: ComputedStyle and ComputedStyleBase

The provided text explains the architectural relationship between ComputedStyle and ComputedStyleBase within the Blink rendering engine. ComputedStyleBase serves as a generated storage engine designed to optimize memory through subgroup sharing and bitfield packing based on automated metadata. In contrast, ComputedStyle acts as a handwritten semantic layer that interprets this raw data to handle CSS logic, caching, and rendering decisions. This dual-class structure allows the engine to maintain a high-performance memory layout while providing a meaningful API for style resolution. By splitting concerns between a machine-generated base and a human-authored derived class, Blink achieves both compact object sizing and complex inheritance behaviors. Ultimately, the sources illustrate how this build-time contract ensures that style state is stored efficiently without sacrificing the sophisticated logic required for web layout and invalidation.