I want to animate CSS transitions between pages

[WebWeWantBot]

Currently, animating elements between pages (like expanding a card to a full page) requires JavaScript rendering and client side routing. Given that the web is built on individual HTML documents, it shouldn't require re-implementing routing to add this functionality.

[gregwhitworth]

Portals will probably solve what you need: https://wicg.github.io/portals/ and for an easier to consume medium with video presentation: https://web.dev/hands-on-portals/

This is a valid want and should be added to the site.

[Malvoz]

See also https://github.com/WICG/shared-element-transitions

[aarongustafson]

Now a Candidate Recommendation: View Transitions