These sources detail the architectural implementation of CSS Paint Worklets within the Blink and Chromium rendering engines. The system operates as a multi-layered pipeline that transforms JavaScript paint callbacks into recorded draw commands, known as PaintRecords, which are eventually rasterized. To ensure high performance, the engine supports a dual execution model that allows painting to occur either synchronously on the main thread or asynchronously via the compositor and a dedicated worklet backing thread. A significant portion of the framework focuses on enforcing statelessness through randomized global scope selection and managing cross-thread data transport for style properties and animations. Ultimately, the architecture treats paint worklets not just as an API, but as a specialized image-generation system integrated into the core CSS value and invalidation flow.