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Specification https://drafts.csswg.org/css-overscroll-behavior-1 Summary Propagate overscroll-behavior from the root instead of the body. The CSS working group resolved[0] on not propagating properties from the body to the viewport. Rather, properties of the viewport are to be propagated from the root element eg scroll-behavior[1], scroll-snap-type[2], scroll-padding[3]. As such, overscroll-behavior should be propagated from the root element. However, Chrome has had a longstanding issue of propagating overscroll-behavior from the body rather than the root, which deviates from the behavior of Safari(WebKit) and Firefox(Gecko). This feature intends to fix this by propagating overscroll-behavior from the root rather than the body. [0] https://github.com/w3c/csswg-drafts/issues/6079#issuecomment-816307011 [1] https://drafts.csswg.org/css-overflow/#:~:text=not%20propagated%20to%20the%20viewport [2] https://drafts.csswg.org/css-scroll-snap/#:~:text=not%20propagated%20from%20HTML%20body [3] https://drafts.csswg.org/css-scroll-snap/#:~:text=padding%20values%20are%20not%20propagated%20from%20HTML%20body Blink component Blink>Scroll TAG review None TAG review status Not applicable Risks Interoperability and Compatibility This fixes an interop issue in which Chrome behaves differently from WebKit(Safari) and Gecko(Firefox). Gecko: Shipped/Shipping WebKit: Shipped/Shipping Web developers: No signals 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? 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? Yes https://wpt.fyi/results/css/css-overscroll-behavior/overscroll-behavior-root.html?label=experimental&label=master&aligned Flag name on about://flags None Finch feature name PropagateOverscrollBehaviorFromRoot Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://crbug.com/41453796 Estimated milestones Shipping on desktop 139 Shipping on Android 139 Shipping on WebView 139 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). None Link to entry on the Chrome Platform Status https://chromestatus.com/feature/6210047134400512?gate=5668569165332480 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 blink-dev+unsubscr...@chromium.org. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/685ed526.170a0220.393dfd.003b.GAE%40google.com.
