LGTM2

On Monday, September 28, 2026 at 4:48:32 PM UTC-7 [email protected] 
wrote:

> Thanks for the update. LGTM1.
>
> On Thursday, September 24, 2026 at 3:12:33 AM UTC-7 [email protected] 
> wrote:
>
>> ok was faster than i thought, the webkit PR 
>> https://github.com/WebKit/WebKit/pull/65464 landed (behind flag)
>>
>> Am Mi., 23. Sept. 2026 um 18:10 Uhr schrieb Helmut Januschka <
>> [email protected]>:
>>
> Updated the entry and changed WebKit's status to "In development.".
>>> Sorry again about the missing platforms checkmark, I filed three entries 
>>> around the same time and missed it on all of them.
>>>
>>> WebKit's position on the underlying corner-shaping proposal is positive:
>>> https://github.com/WebKit/standards-positions/issues/229
>>>
>>> There is an open WebKit PR that importet tests:
>>> https://github.com/WebKit/WebKit/pull/74191
>>>
>>> I also started an implementation. The PR is a bit outdated, but I'll 
>>> revive it in the next few days:
>>> https://github.com/WebKit/WebKit/pull/65464
>>>
>>> I don't know what the WebKit timeline would be, though.
>>>
>>> Am Mi., 23. Sept. 2026 um 17:12 Uhr schrieb Rick Byers <
>>> [email protected]>:
>>>
>> Looks, like it is implemented on all blink platforms and the WebKit 
>>>> position is 'support' but not 'shipping'. Right Helmut?
>>>>
>>>> I'm happy to approve once the chromestatus entry is corrected.
>>>>
>>>> On Mon, Sep 21, 2026 at 11:46 AM Alex Russell <[email protected]> 
>>>> wrote:
>>>>
>>> This looks like a good feature; can you perhaps clarify the WebKit 
>>>>> position? Are they implementing now, or have they just provided support 
>>>>> in 
>>>>> a standards position? I don't think the difference would sway my vote 
>>>>> here, 
>>>>> but we should strive for accuracy. If it's the latter, we should also 
>>>>> send 
>>>>> an FYI to the TAG as we'll be the first to implement.
>>>>>
>>>>> Also, Dan spotted that this is not marked as being supported on all 6 
>>>>> platforms. Presumably that's an oversight?
>>>>>
>>>>> Best,
>>>>>
>>>>> Alex
>>>>>
>>>>> On Friday, September 18, 2026 at 6:33:46 AM UTC-7 [email protected] 
>>>>> wrote:
>>>>>
>>>>>> *Contact emails*
>>>>>> [email protected]
>>>>>>
>>>>>> *Explainer*
>>>>>> https://static.januschka.com/i-425897047
>>>>>>
>>>>>> *Specification*
>>>>>> https://drafts.csswg.org/css-borders-4/#corner-shaping
>>>>>>
>>>>>> *Summary*
>>>>>> Implements the CSS corner shorthand and per-corner sub-shorthands 
>>>>>> (corner-top-left, corner-top-right, corner-bottom-left, 
>>>>>> corner-bottom-right) as well as physical (corner-top, corner-bottom) and 
>>>>>> logical (corner-block-start, corner-block-end, etc.) edge shorthands. 
>>>>>> These 
>>>>>> allow setting both border-radius and corner-shape for individual corners 
>>>>>> in 
>>>>>> a single declaration. Additionally, corners is retained as a compat 
>>>>>> alias 
>>>>>> for the corner shorthand. sampler: 
>>>>>> https://static.januschka.com/i-425897047/ CL: 
>>>>>> https://chromium-review.googlesource.com/c/chromium/src/+/7747994
>>>>>>
>>>>>> *Blink component*
>>>>>> Blink>CSS 
>>>>>> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22>
>>>>>>
>>>>>> *Web Feature ID*
>>>>>> corner-shape <https://webstatus.dev/features/corner-shape>
>>>>>>
>>>>>> *Motivation*
>>>>>> Currently, setting both the radius and shape of a corner requires two 
>>>>>> separate declarations (border-radius and corner-shape). The CSSWG 
>>>>>> resolved 
>>>>>> ( 
>>>>>> https://github.com/w3c/csswg-drafts/issues/11623#issuecomment-2982179370 
>>>>>> ) 
>>>>>> to add a corner shorthand that combines both properties, making it more 
>>>>>> ergonomic for authors to style individual corners. For example: ```css 
>>>>>> /* 
>>>>>> Before: two declarations needed */ border-top-left-radius: 20px; 
>>>>>> corner-shape-top-left: squircle; /* After: single corner shorthand */ 
>>>>>> corner-top-left: 20px squircle; ```
>>>>>>
>>>>>> *Initial public proposal*
>>>>>> https://github.com/w3c/csswg-drafts/issues/6500
>>>>>>
>>>>>> *TAG review*
>>>>>> *No information provided*
>>>>>>
>>>>>> *TAG review status*
>>>>>> Issues addressed
>>>>>>
>>>>>> *Goals for experimentation*
>>>>>> None
>>>>>>
>>>>>> *Risks*
>>>>>>
>>>>>>
>>>>>> *Interoperability and Compatibility*
>>>>>> *No information provided*
>>>>>>
>>>>>> *Gecko*: Positive (
>>>>>> https://github.com/mozilla/standards-positions/issues/823) General 
>>>>>> standards-position discussion for CSS corner shaping. The corner 
>>>>>> shorthands 
>>>>>> are an ergonomic extension that combines the existing corner-shape and 
>>>>>> border-radius properties.
>>>>>>
>>>>>> *WebKit*: Shipped/Shipping (
>>>>>> https://github.com/WebKit/standards-positions/issues/229) WebKit 
>>>>>> supports the underlying CSS corner-shaping proposal. These shorthands 
>>>>>> combine corner-shape and border-radius without adding new rendering 
>>>>>> capabilities.
>>>>>>
>>>>>> *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)?*
>>>>>> No
>>>>>>
>>>>>> *Is this feature fully tested by web-platform-tests 
>>>>>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?*
>>>>>> Yes
>>>>>>
>>>>>>
>>>>>> *Flag name on about://flags*
>>>>>> *No information provided*
>>>>>>
>>>>>> *Finch feature name*
>>>>>> CSSCornersShorthand
>>>>>>
>>>>>> *Rollout plan*
>>>>>> Will ship enabled for all users
>>>>>>
>>>>>> *Requires code in //chrome?*
>>>>>> False
>>>>>>
>>>>>> *Tracking bug*
>>>>>> https://issues.chromium.org/issues/425897047
>>>>>>
>>>>>> *Estimated milestones*
>>>>>> Shipping on desktop 156
>>>>>> Shipping on Android 156
>>>>>> Shipping on WebView 156
>>>>>> Shipping on iOS 156
>>>>>>
>>>>>> *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/5152215540039680?gate=4765188386586624
>>>>>>
>>>>>> This intent message was generated by Chrome Platform Status 
>>>>>> <https://chromestatus.com/>.
>>>>>>
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>>>>
>>>>> To view this discussion visit 
>>>>> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/9a88d4e0-ee44-421d-bbb5-3aab64089854n%40chromium.org
>>>>>  
>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/9a88d4e0-ee44-421d-bbb5-3aab64089854n%40chromium.org?utm_medium=email&utm_source=footer>
>>>>> .
>>>>>
>>>>

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