Contact emails
[email protected]

Specification
https://w3c.github.io/pointerevents/#dom-wheelevent-momentum


Summary
The wheel events on many native platforms simulate scrolling inertia: the 
events continue to fire for a while after the user has lifted the finger from 
the trackpad after a fling interaction. This feature exposes a momentum 
attribute in wheel events which is true only for those simulated events, 
differentiating them from the events fired during the physical scroll 
interaction. This lets web developers ignore fling events or customize rich 
fling effects.


Blink component
Blink>Input


Web Feature ID
Missing feature


Motivation
No information provided


Initial public proposal
No information provided


TAG review
This feature is too small and non-controversial to justify a TAG review.


TAG review status
Not applicable


Goals for experimentation
None


Risks




Interoperability and Compatibility
No information provided

Gecko: Positive 
(https://lists.w3.org/Archives/Public/public-pointer-events/2026JanMar/0148.html#:~:text=smaug%3A%20just%20having%20a%20flag%20should%20be%20easy.%20we%27ll%20just%20have%20to%20do%20%0Asomething%20on%20linux)
 Supported the feature during PEWG meeting on 2026-03-11.

WebKit: No signal

Web developers: Positive (https://github.com/w3c/pointerevents/issues/587) See 
the dev discussion and also many thumbs-up emojis.

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 by web-platform-tests?
No



Flag name on about://flags
No information provided


Finch feature name
WheelEventMomentum


Rollout plan
Will ship enabled for all users


Requires code in //chrome?
False


Tracking bug
https://crbug.com/40704952


Estimated milestones


Shipping on desktop 151

Shipping on Android 151

Shipping on WebView 151




Anticipated spec changes

Open questions about a feature may be a source of future web compat or interop 
issues. Please list open issues (eg links to known github issues in the project 
for the feature specification) whose resolution may introduce web 
compat/interop risk (eg, 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/6631012282007552?gate=5864164607262720


This intent message was generated by Chrome Platform Status.

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