The provided sources describe the Style phase within the Blink rendering engine, detailing how Chromium transforms DOM elements and CSS into computed styles. This process is a lifecycle-integrated pipeline that begins with document-level orchestration, progresses through style invalidation, and culminates in a depth-first tree walk. During this walk, the engine resolves ComputedStyle objects by matching rules from various origins while utilizing MatchedPropertiesCache and SelectorFilter to optimize performance. The phase also includes a layout-tree rebuild, which reconciles the structural representation of the page with new style data before the official layout stage begins. Key components like the StyleEngine, StyleResolver, and ElementRuleCollector work together to handle complex modern features such as Shadow DOM, container queries, and content-visibility. Ultimately, the sources highlight that Blink prioritizes incremental updates and aggressive caching to ensure high-performance rendering.