LGTM3
/Daniel
On 2026-08-19 00:40, TAMURA, Kent wrote:
LGTM2
On Wed, Aug 19, 2026 at 12:33 AM Mike Taylor <[email protected]>
wrote:
LGTM1
On 8/18/26 4:15 a.m., Morten Stenshorne wrote:
*Contact emails*
[email protected]
*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-trimThis 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
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ELayout%22>
*Web Feature ID*
margin-trim <https://webstatus.dev/features/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
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
Yes
https://wpt.fyi/results/css/css-box/margin-trim?label=experimental&label=master&aligned
<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
<https://chromestatus.com/>.
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TAMURA Kent
Software Engineer, Google
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