border-shapeLimited availability
The border-shape CSS property sets the geometry of the border box, changing the shape of any applicable border, border image, focus outline, or shadow.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–146Not supported
147+Supportedsince Apr 7, 2026
Current: 155Edge
12–146Not supported
147+Supportedsince Apr 10, 2026
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–146Not supported
147+Supportedsince Apr 7, 2026
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: border-shape.
Feature detection
CSS · check before using
@supports (border-shape: initial) {
/* styles that rely on border-shape */
}
/* or in JavaScript */
if (CSS.supports("border-shape", "initial")) {
// use it
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (2). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| border-shape | 147 | 147 | ✕ | ✕ | 147 | ✕ | ✕ |
| border-shape.none | 147 | 147 | ✕ | ✕ | 147 | ✕ | ✕ |