This document details how the Blink rendering engine manages the technical lifecycle of View Transitions by coordinating DOM updates with visual animations. Once a developer triggers a transition, the engine enters a discovery phase where it forces style and layout recalculations to precisely map the geometry of new elements. To facilitate the visual shift, a specialized StyleBuilder assembles a temporary User-Agent stylesheet that defines the default cross-fade animations and positions for pseudo-element overlays. The StyleEngine integrates these rules into the rendering pipeline, ensuring that transition-specific elements are correctly styled and synchronized even during complex state transfers. Furthermore, the system includes internal mechanisms to handle cross-document transitions by serializing state data, allowing for consistent testing and execution across different navigation types. Ultimately, these internal hooks automate the heavy lifting of snapshotting and animation, providing a seamless experience that developers can further customize with their own CSS.