LGTM3
On 5/13/26 8:17 a.m., Chris Harrelson wrote:
LGTM2
On Wed, May 13, 2026 at 8:16 AM Alex Russell
<[email protected]> wrote:
LGTM1
On Monday, May 11, 2026 at 11:58:26 AM UTC-7 Chromestatus wrote:
*Contact emails*
[email protected]
*Explainer*
https://github.com/vmpstr/htmldemos/blob/master/gestures/overscroll-behavior-chain.md
*Specification*
https://drafts.csswg.org/css-overscroll-1/#propdef-overscroll-behavior
*Summary*
overscroll-behavior currently has 3 values: none, auto, and
contain. These values affect 2 independent effects: scroll
propagation and local border effect (e.g. overscroll stretch).
none: no propagation, no local effect auto: propagation, local
effect contain: no propagation, local effect This feature
tracks a new value to complete the set: chain: propagation, no
local effect This is useful for effects like side menus
implemented as scrollers. We want to bring the menu in and
when it hits the edge it doesn't overscroll
(stretch/translate). However, it would then allow scroll
chaining to the ancestor. Initial proposal:
https://github.com/w3c/csswg-drafts/issues/13370
*Blink component*
Blink>Scroll
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EScroll%22>
*Web Feature ID*
overscroll-behavior
<https://webstatus.dev/features/overscroll-behavior>
*Motivation*
This feature is useful for effects like side menus implemented
as scrollers. We want to bring the menu in and when it hits
the edge it doesn't overscroll (stretch/translate). However,
it would then allow scroll chaining to the ancestor. There may
be other effects that want to prevent overscroll effects but
allow chaning
*Initial public proposal*
https://github.com/w3c/csswg-drafts/issues/13370
*TAG review*
https://github.com/w3ctag/design-reviews/issues/1228
*TAG review status*
Pending
*Goals for experimentation*
None
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/: No
signal (https://github.com/mozilla/standards-positions/issues/1406)
/WebKit/: No
signal (https://github.com/WebKit/standards-positions/issues/661)
/Web developers/: No signals We've had some use-cases in other
features (overscroll gestures) where this behavior was needed
to avoid awkward interactions
/Other signals/:
*Ergonomics*
None
*Activation*
None
*Security*
None
*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*
This is debuggable as other CSS properties
*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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
https://wpt.fyi/results/css/css-overscroll-behavior?label=master&label=experimental&aligned&q=overscroll-behavior
<https://wpt.fyi/results/css/css-overscroll-behavior?label=master&label=experimental&aligned&q=overscroll-behavior>
(Added via https://github.com/web-platform-tests/wpt/pull/59792)
*Flag name on about://flags*
/No information provided/
*Finch feature name*
CSSOverscrollBehaviorChain
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/499018879
*Estimated milestones*
Shipping on desktop 150
Shipping on Android 150
Shipping on WebView 150
*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/5176802466201600?gate=4784727853760512
*Links to previous Intent discussions*
Intent to Prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69ceb225.050a0220.1c79a0.01ba.GAE%40google.com
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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