Intent to Ship: CSSOM View smooth scroll API

[Yunjia (Sandra) Sun]

Contact emails

aj...@chromium.org, yma...@chromium.org, suny...@chromium.org

Spec

http://dev.w3.org/csswg/cssom-view/ (See sections 4, 5, 7, 12, and 13.)

Summary

This adds an optional ScrollOptions and an optional ScrollIntoViewOptions arguments to CSSOM scrolling APIs; these additional arguments allows specifying that a particular scroll should be performed smoothly rather than instantly. This also adds a scroll-behavior CSS property, which specifies whether scrolls performed on a scrolling box (via CSSOM scrolling APIs or via navigation) should be smooth or instant.

Link to “Intent to Implement” blink-dev discussion

Intent to Implement: CSSOM View smooth scroll API

Is this feature supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

Yes.

Interoperability and Compatibility Risk

Edge: They have this as "Under consideration" at https://developer.microsoft.com/en-us/microsoft-edge/platform/status/cssomviewsmoothscrollapi/?q=cssom

Firefox: Shipped

Safari: No signals

Web developers: Positive

OWP launch tracking bug

crbug.com/243871

Entry on the feature dashboard

https://www.chromestatus.com/features/5812155903377408

[Dimitri Glazkov]

LGTM1

[Philip Jägenstedt]

Hi Yunjia,

Recently we've begun asking about shared test suites in Intent to Ship, and today I tweaked our template to include this section:

Is this feature fully tested by web-platform-tests?

Please link to the test suite. If any part of the feature is not tested by web-platform-tests, please include links to issues, e.g.:

• A web-platform-tests issue with the "infra" label explaining why a certain thing cannot be tested. (example)

• A spec issue for some change that would make it possible to test. (example)

• A Chromium issue to upstream some existing tests. (example)

Such issues are not blocking in an Intent to Ship.

I search for some keywords in web-platform-tests and didn't find any tests. That's OK at this stage, but can you describe how the feature is currently tested and file bugs that track getting that test coverage into web-platform-tests?

P.S. The REF for this is CSSOMSmoothScroll, which helps to see exactly what the API surface is.

[Yunjia (Sandra) Sun]

Hi Philip,

I've uploaded a patch that includes the web-platform-test. This patch modifies the idl file and has already landed, so we hope to get this Intent-to-Ship LGTMed soon :)

Thanks!

[Hayato Ito]

Could you make sure that wpt covers the case where Shadow DOM is used?

The context: I was ping-ed in https://github.com/w3c/csswg-drafts/issues/1527

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[Philip Jägenstedt]

I've left a few comments on the review. With that and sufficient Shadow DOM coverage, LGTM2.

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[Chris Harrelson]

LGTM3

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