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 *Web developers*: No signals *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.
