This is tracked as https://issues.chromium.org/41442840 and enabled in https://chromium-review.googlesource.com/c/chromium/src/+/6639816 which should be in 139.0.7235.0
On Wed, Jun 11, 2025 at 1:05 PM Chromestatus < ad...@cr-status.appspotmail.com> wrote: > Contact emails fla...@chromium.org > > Specification https://www.w3.org/TR/css-transitions-1/#starting > > Summary > > When the transition related properties change, they are only supposed to > affect newly started transitions. This means that if you change the > transition properties, unless you also change the properties which have > active transition animations, those transition animations will continue > with the previously specified duration, easing, etc. Blink incorrectly > canceled transitions when the transition property was set to "none", even > though it doesn't cancel them if you only change the transition-duration. > With this feature, blink will be consistent with webkit and gecko, allowing > active transitions to continue running, unless/until their property value > changes triggering a new transition update. > > > Blink component Blink>Animation > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EAnimation%22> > > TAG review None > > TAG review status Not applicable > > Risks > > > Interoperability and Compatibility > > This change brings chromium / blink into alignment with the other two > major browser engines. If developers were only testing on chromium, they > may have transitions run which did not used to on chromium. However, given > this is what is happening on other browsers it will help ensure they can > build a consistent experience. According to our use counter, this may > affect up to 4.5% of page loads: > https://chromestatus.com/metrics/feature/timeline/popularity/2914 > > > *Gecko*: Shipped/Shipping > > *WebKit*: Shipped/Shipping > > *Web developers*: No signals > > *Other signals*: > > 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 > > None > > > Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, 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 > > > https://wpt.fyi/results/css/css-transitions/changing-while-transition-004.html?label=experimental&label=master&aligned > Apologies, this should be yes, it is covered by wpt. I updated the chromestatus entry. > Flag name on about://flags Experimental Web Platform features > > Finch feature name CSSTransitionNoneRunningTransitionsFix > > Rollout plan Will ship enabled for all users > > Requires code in //chrome? False > > Measurement The CSSTransitionCancelledByRemovingStyle counter measures > how often this change will result in a transition that is no longer > canceled: > https://chromestatus.com/metrics/feature/timeline/popularity/2914 > > Sample links > https://jsbin.com/tesuliz/edit?html,css,js,output > > Estimated milestones > Shipping on desktop 139 > Shipping on Android 139 > Shipping on WebView 139 > > 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/5194501932711936?gate=5142683420721152 > > This intent message was generated by Chrome Platform Status > <https://chromestatus.com>. > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJh39TMEyjPY_tGqqUvP2A5mCT7geV5yvrfAtjwPDYT48ERtrw%40mail.gmail.com.
