On 5/27/26 9:21 a.m., Mike Taylor wrote:
On 5/26/26 11:33 p.m., Chromestatus wrote:
*Contact emails*
[email protected]
*Specification*
https://drafts.csswg.org/css-shapes-1/#funcdef-basic-shape-polygon
*Summary*
Allows an optional corner-rounding parameter in the polygon() CSS
shape function. Developers can specify a length value to round
polygon corners without manually computing bezier curves. Interactive
demo: https://codepen.io/yisi/pen/NPRLEQN CSSWG issue:
https://github.com/w3c/csswg-drafts/issues/9843
*Blink component*
Blink>CSS
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22>
*Web Feature ID*
shape-function <https://webstatus.dev/features/shape-function>
*Motivation*
Rounded polygons are a common design pattern on the web. Without this
feature, developers who want rounded corners on a polygon shape must
manually compute bezier control points or use workarounds such as SVG
clip paths. The polygon() round parameter makes this directly
expressible in CSS, reducing complexity and improving maintainability.
*Initial public proposal*
/No information provided/
*TAG review*
/No information provided/
Did TAG ever look at this?
*TAG review status*
Not applicable
*Goals for experimentation*
None
*Risks*
*Interoperability and Compatibility*
/No information provided/
/Gecko/: No
signal (https://github.com/mozilla/standards-positions/issues/1197)
/WebKit/: No
signal (https://github.com/WebKit/standards-positions/issues/474)
/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
Could you also please link to WPTs here?
*Flag name on about://flags*
/No information provided/
*Finch feature name*
CSSPolygonRounding
*Rollout plan*
Will ship enabled for all users
*Requires code in //chrome?*
False
*Tracking bug*
https://issues.chromium.org/issues/329302249
*Estimated milestones*
Shipping on desktop 150
Shipping on Android 150
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/6636392944893952?gate=6487513336250368
This intent message was generated by Chrome Platform Status
<https://chromestatus.com>.
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