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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 (eg 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 Web Feature ID 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? Yes 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 (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/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. -- 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 [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6a0226c3.710a0220.3a767f.024f.GAE%40google.com.
