On Thu, Sep 11, 2025 at 1:06 PM Robert Flack <fla...@chromium.org> wrote:
> Contact emailsfla...@chromium.org, perryuw...@gmail.com > > Specification > https://www.w3.org/TR/css-overscroll-1/#propdef-overscroll-behavior > > Summary > > The overscroll-behavior applies to all scroll container elements, > regardless of whether those elements currently have overflowing content or > are user scrollable. Developers can use overscroll-behavior to prevent > scroll propagation on an `overflow: hidden` backdrop or an `overflow: auto` > element without needing to consider whether it will currently be > overflowing. > > > Blink componentBlink>Scroll > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EScroll%22> > > Web Feature IDoverscroll-behavior > <https://webstatus.dev/features/overscroll-behavior> > > TAG reviewNone > > TAG review statusNot applicable > > Risks > > > Interoperability and Compatibility > > This should be implemented on other browsers as well, as it matches the > specification. However, until this happens there are compatibility risks > that some sites may over accidentally set overscroll-behavior on elements > which don't currently apply today (either overflow: auto or not having > overflow) and will start applying, or that developers will rely on this > behavior and have accidental scroll chaining in other browsers until they > implement it as well. This change will affect a large number of sites per > https://chromestatus.com/metrics/feature/timeline/popularity/5596. I have > done compat analysis of many of the top sites affected by this in > https://issues.chromium.org/issues/41371072#comment45 and found it to > either not have a meaningful impact or to better honor the developer > specified intent. > > > *Gecko*: No signal > > *WebKit*: No signal > Could you file for standards positions as well? > > *Web developers*: No signals > There is evidence of developer demand for what you're planning to ship, right? > > *Other signals*: > > Ergonomics > > This improves the ergonomics of overscroll-behavior, fixing the current > unpredictable layout dependent behavior we have today. > > > Activation > > It may be difficult for developers to take advantage of this fix before it > is adopted in other browsers as it is likely not possible to feature > detect. They could remove pre-existing hacks to get this functionality > (i.e. ensuring 1px overflow) on supporting chromium browsers. > > > 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> > ?Yes > > > https://wpt.fyi/results/css/css-overscroll-behavior/overscroll-behavior-without-overflow.html?label=experimental&label=master&aligned > > > Flag name on about://flagsNone > > Finch feature nameOverscrollBehaviorRespectedOnAllScrollContainers > > Rollout planWill ship enabled for all users > > Requires code in //chrome?False > > MeasurementThe OverscrollBehaviorOnNonScrollableScrollContainer feature > counter measures how often this new behavior is or would be triggered. > https://chromestatus.com/metrics/feature/timeline/popularity/5596 > > Sample links > https://ebidel.github.io/demos/chatbox.html > https://codepen.io/rctneil/pen/rJYONj > > Estimated milestones > > No milestones specified > > > 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/5129635997941760?gate=5124735842910208 > > -- > 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/CAJh39TOXh63zS2ZaZBqsMo0v7%3DoFZQMv1phEVv8pLe%3D%3Dob9-pQ%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAJh39TOXh63zS2ZaZBqsMo0v7%3DoFZQMv1phEVv8pLe%3D%3Dob9-pQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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