LGTM2, and in particular thanks for the clear spec issues analysis.

Probably you should move the tests out of the /tentative/ subdirectory?

On Thursday, June 12, 2025 at 2:01:28 AM UTC+9 Noam Rosenthal wrote:

> Contact emailsnrosent...@chromium.org
>
> Explainer
> https://github.com/noamr/explainers/blob/main/corner-shape-explainer.md
>
> Specificationhttps://drafts.csswg.org/css-borders-4/#corner-shaping
>
> Summary
>
> Enable styling corners, on top of the existing border-radius, by 
> specifying the shape/curvature of the corner. This allows shapes like 
> squircles, notches, scoops etc., and animating between them.
>
>
> Blink componentBlink>CSS 
> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22>
>
> TAG reviewhttps://github.com/w3ctag/design-reviews/issues/1090
>
> TAG review statusIssues addressed
>
> Risks
>
>
> Interoperability and Compatibility
>
> None
>
>
> *Gecko*: No signal (
> https://github.com/mozilla/standards-positions/issues/823)
>
> *WebKit*: Support (
> https://github.com/WebKit/standards-positions/issues/229)
>
> *Web developers*: Strongly positive (
> https://www.figma.com/blog/desperately-seeking-squircles)
>
> *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?
>
> None
>
>
> Debuggability
>
> None
>
>
> 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, though some the rendering specific (e.g. color joins and dots) are 
> implementation specific and tested in internal web-tests.
> See 
> https://wpt.fyi/results/css/css-borders/tentative/corner-shape?label=master&label=experimental&aligned&q=corner-shape
>
> Flag name on about://flagsCSSCornerShape
>
> Finch feature nameCSSCornerShape
>
> Rollout planWill ship enabled for all users
>
> Requires code in //chrome?False
>
> Tracking bughttps://issues.chromium.org/issues/393145930
>
> Estimated milestones
> Shipping on desktop 139
> DevTrial on desktop 136
> Shipping on Android 139
> DevTrial on Android 136
> Shipping on WebView 139
>
> Anticipated spec changes
>
> The base of the spec is quite stable at this point, and is ready to be 
> used by developers. Here is a list of spec issues related to corner-shape:
>
>
> https://github.com/w3c/csswg-drafts/issues/11623 
> <https://github.com/w3c/csswg-drafts/issues/11623:>
>
> A shorthand, compatible with current longhands: 
> planning to ship this shorthand once the details are resolved, either 
> together with the existing content or in a subsequent release. I believe we 
> can give what's implemented to developers, and add the shorthand a bit 
> later if needed.
>
>
> * https://github.com/w3c/csswg-drafts/issues/11622
>
> * https://github.com/w3c/csswg-drafts/issues/11679
>
> * https://github.com/w3c/csswg-drafts/issues/12150
>
> These are future compatible enhancements.
>
>
> https://github.com/w3c/csswg-drafts/issues/11764 
>
> Some rendering questions, but in an area that is implementation defined 
> anyway (color-joins are not interoperable or spec'ed, before corner-shape).
>
>
> An FPWD for css-borders-4 is underway.
>
>
> Link to entry on the Chrome Platform Status
> https://chromestatus.com/feature/5357329815699456?gate=5559845778096128
>
> Links to previous Intent discussionsIntent to Prototype: 
> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/67a0cde5.2b0a0220.164bff.00a8.GAE%40google.com
>
>
> This intent message was generated by Chrome Platform Status 
> <https://chromestatus.com/>.
>

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