Intent to Ship: Margin-trim

[Morten Stenshorne]

Contact emails

mste...@chromium.org

Specification

https://drafts.csswg.org/css-box-4/#margin-trim

Summary

The `margin-trim` CSS property may be used to omit margins before or after the first or last child of a container. This is supported on regular block containers and multicol containers. Note: A previous version of the spec also applied this for flex and grid containers, but this has been removed. https://drafts.csswg.org/css-box-4/#margin-trim This is somewhat similar to the effect caused by the margin quirk that is applied to P, H1, H2... elements inside BODY and table cell elements (in quirks mode), but more powerful, generic, and expressive.

Blink component

Blink>Layout

Web Feature ID

margin-trim

Motivation

No information provided

Initial public proposal

No information provided

TAG review

No information provided

TAG review status

Not applicable

Goals for experimentation

None

Risks

Interoperability and Compatibility

No information provided

Gecko: Positive (https://bugzilla.mozilla.org/show_bug.cgi?id=1506241) Mozilla are actively working on implementing this feature.

WebKit: Shipped/Shipping (https://webkit.org/blog/16854/margin-trim)

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?

No information provided

Debuggability

No information provided

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-box/margin-trim?label=experimental&label=master&aligned

Flag name on about://flags

No information provided

Finch feature name

MarginTrim

Rollout plan

Will ship enabled for all users

Requires code in //chrome?

False

Tracking bug

https://issues.chromium.org/issues/40886857

Estimated milestones

Shipping on desktop	155
Shipping on Android	155
Shipping on WebView	155

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).

No information provided

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5197863732772864?gate=6474161734156288

Links to previous Intent discussions

Intent to Prototype: https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAKWZFm4REgNxwYFjJTZw-fUnxc1NGk2naOevLZCzOqLdL8eQBw%40mail.gmail.com

This intent message was generated by Chrome Platform Status.