Contact emails [email protected]
Explainer https://github.com/explainers-by-googlers/promisify-scroll Specification https://github.com/w3c/csswg-drafts/issues/1562 Design docs https://github.com/explainers-by-googlers/promisify-scroll Summary Web developers currently have no way to know when a programmatic smooth-scroll has completed. This feature provides a solution to the problem: make the programmatic scroll methods return Promise objects that get resolved on scroll completion. Blink component Blink>Scroll Web Feature ID Missing feature Motivation We have multiple scroll methods available through both Element and Window interfaces. These methods return immediately with the value undefined, which was fine during the early days of the web when scroll was assumed to be instant. This behavior no longer seems adequate from a web developer's perspective today: there is widespread support for smooth-scroll (see browser_compatibility [1] for the CSS property), and it is not easy for the developers to determine when a particular call for a smooth-scroll has completed. This feature makes the programmatic scroll methods return Promise objects that get resolved on scroll completion. [1] https://developer.mozilla.org/en-US/docs/Web/CSS/scroll-behavior#browser_compatibility Initial public proposal No information provided TAG review https://github.com/w3ctag/design-reviews/issues/1210 TAG review status Pending Goals for experimentation None Risks Interoperability and Compatibility Interop: Given the developers' support in the github discussion and the easy resolution in the CSWWG, we expect other major browsers to implement this feature in near future. Compat: To maintain the backward compatibility for the scroll methods, we would avoid rejecting the returned Promises (as much as possible). This is because unhandled Promise rejections are treated as exceptions, which could fail any JS callers that assume that those methods succeed unconditionally. Gecko: No signal (https://github.com/mozilla/standards-positions/issues/1379) Spec PR was approved by Mozilla: https://github.com/w3c/csswg-drafts/pull/12355 WebKit: No signal (https://github.com/WebKit/standards-positions/issues/639) WebKit positive in a follow-up resolution: https://github.com/w3c/csswg-drafts/issues/12495#issuecomment-4040657058 Web developers: Positive (https://github.com/w3c/csswg-drafts/issues/1562) Other signals: 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 Existing DevTools functionalities sufficiently cover this features: the return values of element/window scroll methods are switched from undefined to Promises, and the returned Promises can be inspected easily on console. 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/cssom-view?label=master&label=experimental&aligned&q=-scroll-arguments.html%20or%20-scroll-promises.html%20or%20-scroll-promise-interruption.html Flag name on about://flags No information provided Finch feature name ProgrammaticScrollPromise Rollout plan Will ship enabled for all users Requires code in //chrome? False Tracking bug https://issues.chromium.org/41406914 Estimated milestones Shipping on desktop 149 Shipping on Android 149 Shipping on WebView 149 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/5082138340491264?gate=5098794827644928 Links to previous Intent discussions Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAB0cuO7QpgC2bUgHk6ZWLsNjaR%3DLb-O%3DA5hiOF5vgJicbR9igQ%40mail.gmail.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/69cc2140.2b0a0220.5f79f.04fa.GAE%40google.com.
