Thanks Alison!

On Thu, May 28, 2026 at 11:00 AM 'Alison Maher' via blink-dev <
[email protected]> wrote:

> Hi Ian,
>
> Super excited to see this rolling out!
>
> I had a quick question about the missing Web Feature ID. I didn't see a
> request <https://github.com/web-platform-dx/web-features/issues> filed
> for it. I suspect it would make sense to assign a temporary ID for this new
> functionality until it’s more broadly available (separate from the general
> flexbox ID)?


Filed under https://github.com/web-platform-dx/web-features/issues/4081


>
> Also, re: WPTs, do we have any coverage for 'flex-wrap: balance' in
> fragmentation scenarios (perhaps in another folder?)
>
> Based on how flex fragmentation is implemented, I suspect it should just
> work out of the box, but some cases that may be interesting to test would
> be in forced break scenarios where lines can end up expanding. I suspect we
> don't want to re-run layout in those cases and accept that it may not be
> fully balanced in the end?
>

I'll add some rudimentary ones next week. Broadly speaking it shouldn't
affect our existing fragmentation logic at all. Balancing just picks
different line break-points, so can rely on our existing logic for wrapping
flexboxes. Nothing else further than line-breaking changes.


> Thanks,
> Alison
>
> On Wednesday, May 27, 2026 at 9:35:39 AM UTC-7 Chromestatus wrote:
>
>> *Contact emails*
>> [email protected]
>>
>> *Explainer*
>> https://github.com/bfgeek/flex-wrap-balance
>>
>> *Specification*
>> https://drafts.csswg.org/css-flexbox-2
>>
>> *Summary*
>> flex-wrap:balance allows developers to distribute content between
>> flex-lines so that it appears more balanced (similar to text-wrap:balance).
>>
>> *Blink component*
>> Blink>Layout>Flexbox
>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ELayout%3EFlexbox%22>
>>
>> *Web Feature ID*
>> *No information provided*
>>
>> *Motivation*
>> Without balancing it is trivial to create flex-lines which appear
>> "unablanced" (lots of whitespace in a particular line). This often makes
>> developers avoid wrapping flexboxes, instead allowing content to overflow.
>> See explainer.
>>
>> *Initial public proposal*
>> https://github.com/w3c/csswg-drafts/issues/3070
>>
>> *TAG review*
>> https://github.com/w3ctag/design-reviews/issues/1227
>>
>> *TAG review status*
>> Issues addressed
>>
>> *Goals for experimentation*
>> None
>>
>> *Risks*
>>
>>
>> *Interoperability and Compatibility*
>> Interoperability risk: Other browsers do not implement.
>>
>> *Gecko*: No signal (
>> https://github.com/mozilla/standards-positions/issues/1405)
>>
>> *WebKit*: No signal (
>> https://github.com/WebKit/standards-positions/issues/660)
>>
>> *Web developers*: Positive (
>> https://bsky.app/profile/una.im/post/3lpcjcjn4w22r)
>>
>> *Other signals*:
>>
>> *Activation*
>> Unlike other CSS features, this may be adopted incrementally by
>> web-developers as it "gracefully degrades" if not supported. We saw this
>> previously with `text-wrap:balance` for example.
>>
>> *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*
>> Small CSS addition.
>>
>> *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-flexbox/balance
>>
>> *Flag name on about://flags*
>> experimental-web-platform-features
>>
>> *Finch feature name*
>> FlexWrapBalance
>>
>> *Rollout plan*
>> Will ship enabled for all users
>>
>> *Requires code in //chrome?*
>> False
>>
>> *Tracking bug*
>> https://issues.chromium.org/issues/416755656
>>
>> *Measurement*
>> WebDXFeature::kFlexWrapBalance
>>
>> *Estimated milestones*
>> Shipping on desktop 150
>> DevTrial on desktop 149
>> Shipping on Android 150
>> DevTrial on Android 149
>> Shipping on WebView 150
>>
>> *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/4547107962486784?gate=6499348504117248
>>
>> *Links to previous Intent discussions*
>> Intent to Prototype:
>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/67eae2d6.170a0220.8108a.099e.GAE%40google.com
>>
>>
>> This intent message was generated by Chrome Platform Status
>> <https://chromestatus.com>.
>>
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