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The Layer Cake skill empowers developers to build sophisticated Svelte data visualizations by providing expert guidance on a headless framework that separates data logic from rendering. It handles the heavy lifting of D3 scale calculations and responsive dimension management, allowing developers to seamlessly mix SVG, Canvas, and HTML rendering contexts within a single coordinate system. Whether building simple time-series charts or high-performance visualizations with thousands of data points, this skill ensures best practices for data transformation, accessibility, and performant implementation patterns.