The new View Transition API and scroll-driven animations are just wonderful. No JavaScript needed.
It's such a shame that Firefox is missing that feature, but anybody using a WebKit-based browser will have the smooth transitions between pages along with images moving into place between pages, and the scrolling animation when scrolling through Upscaler's website.

View Transition API - Web APIs | MDN
The View Transition API provides a mechanism for easily creating animated transitions between different website views. This includes animating between DOM states in a single-page app (SPA), and animating the navigation between documents in a multi-page app (MPA).
