the page container and animation clock keeper. Page holds frame trees and the PageAnimator that services script‑driven animations on each tick. It’s the top‑level context for the document/view that WebFrameWidgetImpl coordinates with. You see it pulled into the document and frame code paths whenever lifecycle‑wide actions are taken. (Chromium Git Repositories)

Important relationships

* Owns PageAnimator used when Blink services CSS/Web Animations during lifecycle updates. (Chromium Git Repositories)

Hands off to: LocalFrame/LocalFrameView for concrete style/layout/paint work.