Intent to prototype and ship: View transition types

[Emilio Cobos Álvarez]

Hi,

In bug 2001878 I'm planning to implement view transition types.

This is an extension to view transitions that allows you to easily
assign a set of types to a particular transition.

It's more useful on cross-document transitions, but it's useful for
single-document transitions as well. It's shipped in other browsers and
in fact some frameworks just fall back to no-transition if absent [1].

Bug: https://bugzil.la/2001878

Specification:
https://drafts.csswg.org/css-view-transitions-2/#the-active-view-transition-type-pseudo

Platform coverage: All

Preference: Existing dom.viewTransitions.enabled

DevTools / Extensions bug: N/A, devtools should continue to work and
expose the right rules.

Standards position:
https://github.com/mozilla/standards-positions/issues/905

Other browsers: Both Blink and WebKit ship this since quite a while.

web-platform-tests:
https://wpt.fyi/results/css/css-view-transitions?label=master&label=experimental&aligned&q=view-transition-types

Thanks,

-- Emilio

[1]: https://github.com/facebook/react/pull/31996