1 Blink View Transition SPA: DOM Entry Points Deep Dive

This technical documentation describes the internal architecture of the View Transition API within Google’s Blink rendering engine. The system relies on the ViewTransitionSupplement class to manage per-document states and coordinate between web scripts and the engine's internal processes. A script-facing object, DOMViewTransition, acts as a bridge that handles JavaScript promises and executes developer-provided DOM update callbacks. Meanwhile, the ViewTransition class serves as the core state machine, meticulously controlling the lifecycle of a transition from initial visual snapshots to final animations. The sources also highlight ScopedViewTransition, a newer feature that allows these animated transitions to be applied to specific elements rather than the entire page. Collectively, these components ensure that single-page application transitions remain synchronized, memory-efficient, and smooth for end users.