Contact emailsvmp...@chromium.org, nrosent...@chromium.org

Explainer
https://github.com/vmpstr/web-proposals/blob/main/explainers/view-transition-types.md

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

Summary

This feature allows View transition API use to be customized for different
types of transitions. Specifically, this adds an ability to add "types" to
`startViewTransition` call which will identify the types of the transition.
As well, it will match a pseudo-class, called
`:active-view-transitions(...)` with a parameter matching the type for the
duration of the view transition. Combined these two features provide a way
for the author to declare several view transitions once and only trigger
one at a time. See example usage in the spec:
https://drafts.csswg.org/css-view-transitions-2/#the-active-view-transition-pseudo

Blink componentBlink>ViewTransitions>SPA
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EViewTransitions%3ESPA>

TAG reviewhttps://github.com/w3ctag/design-reviews/issues/908

TAG review statusPending

Risks


Interoperability and Compatibility

There are minimal interop and copmat risks. This feature is an extension to
the View Transitions API that makes it more ergonomic to specify multiple
transitions declaratively, while triggering only one of them at a time.


*Gecko*: No signal (
https://github.com/mozilla/standards-positions/issues/905)

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/266)

*Web developers*: No (strong) signals, the feature request came from a web
developer: https://github.com/w3c/csswg-drafts/issues/8960

*Other signals*:

Ergonomics

This feature would be used with the View Transitions API to be able to
easier maintain a declarative set of multiple transitions that can be
triggered. This solution uses a descendant combinator heavily to
selectively style elements in the DOM, but this is not any different from
the polyfill approach of toggling a class on :root.


Activation

This feature can be used directly and fairly easily.


Security

There are no additional security considerations over the View Transitions
API.


WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None


Debuggability

This feature is debuggable in the same way as the View Transitions API, and
also in the same way as other CSS properties.


Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, Chrome OS, Android, and Android WebView)?Yes

Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?No

Flag name on chrome://flagsViewTransitionTypes

Finch feature nameViewTransitionTypes

Requires code in //chrome?False

Tracking bughttps://bugs.chromium.org/p/chromium/issues/detail?id=1466251

Estimated milestones
Shipping on desktop 121
Shipping on Android 121
Shipping on WebView 121

Anticipated spec changes

Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5089552511533056

Links to previous Intent discussionsIntent to prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CADsXd2NjgR_%2BTbJbU5O%2BiyhnqxypDAUh7LWHUCWy%3DNnaBCY%2B1g%40mail.gmail.com

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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