LGTM3
/Daniel
On 2025-12-09 02:52, TAMURA, Kent wrote:
LGTM2
On Sat, Dec 6, 2025 at 2:02 AM Philip Jägenstedt <[email protected]>
wrote:
LGTM1, thanks for fixing this oversight!
On Thu, Dec 4, 2025 at 2:44 PM Javier Fernandez
<[email protected]> wrote:
*Contact emails*
[email protected]
*Specification*
https://drafts.csswg.org/css-animations/#interface-globaleventhandlers
*Design docs*
/No information provided/
https://developer.mozilla.org/en-US/docs/Web/API/Element/animationcancel_event
*Summary*
The CSS Animations Level 1 extends [1] the GlobalEventsHandler
Interface defined in the HTML spec [2], declaring 4 new event
handlers: onanimationstart, onanimationiteration,
onanimationend and onanimationcancel. Only the
'onanimationcancel' event handler has been missing from the
GobalEventsHandler IDL.
[1]https://drafts.csswg.org/css-animations/#interface-globaleventhandlers
[2]https://html.spec.whatwg.org/multipage/webappapis.html#globaleventhandlers
*Blink component*
Blink>Animation
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EAnimation%22>
*Web Feature ID*
animations-css <https://webstatus.dev/features/animations-css>
*Motivation*
The 'onanimationcancel" event handler should be exposed
through the GlobalEventHandlers interface so that web
applications can detect when the animation stops running in a
way that does not fire an 'animationend' event, such as a
change in the 'animation-name' that removes the animation, or
the animating element or one of its ancestors becoming
display:none.
*Initial public proposal*
/No information provided/
*TAG review*
/No information provided/
*TAG review status*
Not applicable
*Risks*
*Interoperability and Compatibility*
This change improves interop making Chrome match with the rest
of the engines, which has been already shipped the feature
long time ago.
/Gecko/:
Shipped/Shipping
(https://searchfox.org/firefox-main/rev/f81fae7890605739dd8dde14755f159fe6beb8aa/dom/webidl/EventHandler.webidl#134)
https://bugzilla.mozilla.org/show_bug.cgi?id=1302648
/WebKit/:
Shipped/Shipping
(https://github.com/WebKit/WebKit/blob/0c009bd3041dcffddadd9656a928076ba262462f/Source/WebCore/animation/GlobalEventHandlers%2BCSSAnimations.idl#L31)
/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?
/No information provided/
*Debuggability*
/No information provided/
*Will this feature be supported on all six Blink platforms
(Windows, Mac, Linux, ChromeOS, Android, and Android WebView)?*
No
*Is this feature fully tested byweb-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
There is 'css/css-animations/idlharness.html' [1] test to
check whether the attribute it's properly exposed in the
globalEventHandler interface.
[1]
https://wpt.fyi/results/css/css-animations/idlharness.html?label=master&label=experimental&aligned
<https://wpt.fyi/results/css/css-animations/idlharness.html?label=master&label=experimental&aligned>
*Flag name on about://flags*
N/A
*Finch feature name*
/No information provided/
*Non-finch justification*
No need for a finch flag given that the 'cancelanimation'
event has been implemented long ago and this change it's just
about exposing it through the globalEventsHandlers interface
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/464010037
*Estimated milestones*
Shipping on desktop 145
Shipping on Android 145
Shipping on WebView 145
*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).
/No information provided/
*Link to entry on the Chrome Platform Status*
https://chromestatus.com/feature/5160464445210624?gate=6492452351508480
This intent message was generated byChrome Platform Status
<https://chromestatus.com/>.
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TAMURA Kent
Software Engineer, Google
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