Intent to Ship: Intersection Observer Scroll Margin

[Traian Captan]

Contact emails

tca...@chromium.org

Explainer

None

Specification

https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-scrollmargin

Summary

Intersection Observer scrollMargin allows developers to observe targets inside nested scroll containers that are currently clipped away by the scroll containers. This is achieved by expanding the container's clipping rect by the scrollMargin when calculating the intersection.

Blink component

Blink

Search tags

Intersection Observer, scrollMargin

TAG review

None

TAG review status

Not applicable

Risks

Interoperability and Compatibility

None

Gecko: Positive (https://github.com/w3c/IntersectionObserver/issues/431)

WebKit: Positive (https://github.com/w3c/IntersectionObserver/issues/431)

Web developers: Positive (https://github.com/w3c/IntersectionObserver/issues/431)

Other signals:

Ergonomics

N/A

Activation

N/A

Security

N/A

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

N/A

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

Yes

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

Yes

Flag name on chrome://flags

IntersectionObserverScrollMargin

Finch feature name

None

Non-finch justification

This feature is behind an enabled-by-default flag that can be disabled if needed.

Requires code in //chrome?

False

Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1469500

Estimated milestones

Shipping on desktop	119
DevTrial on desktop	119

Shipping on Android	119
DevTrial on Android	119

Shipping on WebView

119

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/5091020593430528

Links to previous Intent discussions

Intent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFxahvsWGzF5au6c5%2BfVrh1hOCq_Y0rY0VF_bsmO8VVysg3QTg%40mail.gmail.com

This intent message was generated by Chrome Platform Status.

[Alex Russell]

This looks relatively non-controversial, but why wasn't a TAG review requested?

[Traian Captan]

Hi Alex,

The much larger intersection observer feature went through a TAG review in https://github.com/w3ctag/design-reviews/issues/197, and this is only a minor addition to that.

Regards,

Traian

[Traian Captan]

Hi Alex,

Just in case, I file a TAG review issue:
https://github.com/w3ctag/design-reviews/issues/905

Regards,

Traian

[Mike Taylor]

LGTM1

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[Yoav Weiss]

On Tuesday, September 26, 2023 at 1:10:34 AM UTC+2 Traian Captan wrote:

Contact emailstca...@chromium.org

ExplainerNone

Specificationhttps://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-scrollmargin

Summary

Intersection Observer scrollMargin allows developers to observe targets inside nested scroll containers that are currently clipped away by the scroll containers. This is achieved by expanding the container's clipping rect by the scrollMargin when calculating the intersection.

Blink componentBlink

Search tagsIntersection Observer, scrollMargin

TAG reviewNone

TAG review statusNot applicable

Risks

Interoperability and Compatibility

None

Gecko: Positive (https://github.com/w3c/IntersectionObserver/issues/431)

WebKit: Positive (https://github.com/w3c/IntersectionObserver/issues/431)

Do you know of Gecko and WebKit's implementation plans for this?

Link to entry on the Chrome Platform Statushttps://chromestatus.com/feature/5091020593430528

Links to previous Intent discussionsIntent to prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAFxahvsWGzF5au6c5%2BfVrh1hOCq_Y0rY0VF_bsmO8VVysg3QTg%40mail.gmail.com

[Traian Captan]

Hi Yoav,

I don't know of Gecko's and WebKit's concrete implementation plans for Intersection Observer Scroll Margin.

However, based on their responses on the github issue they were supportive.

Regards,

Traian

[Yoav Weiss]

On Wed, Oct 4, 2023 at 10:27 PM Traian Captan <tca...@chromium.org> wrote:

Hi Yoav,

I don't know of Gecko's and WebKit's concrete implementation plans for Intersection Observer Scroll Margin.

However, based on their responses on the github issue they were supportive.

Just wanted to note that we typically ask for official positions on the different vendors standard positions repo.

But given the fact that this is a change Mozilla folks requested and Apple folks consistently supported on the issue, I think it's fine to not file those in this case.

[Yoav Weiss]

LGTM2

[Alex Russell]

Given that the TAG didn't respond in two weeks, I'm going to LGTM1

[Chris Harrelson]

LGTM3 that is :)

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[Traian Captan]

Thank you all!