Anchor positioning animations and transitionsLimited availability
The anchor() and anchor-size() CSS functions animate or transition on changes such as the anchor box moving or the anchor element changing.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–124Not supported
125+Supportedsince May 14, 2024
Current: 155Edge
12–124Not supported
125+Supportedsince May 17, 2024
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
1–18.6Not supported
26+Supportedsince Sep 15, 2025
Current: 27MobileChrome Android
18–124Not supported
125+Supportedsince May 14, 2024
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
1–18.6Not supported
26+Supportedsince Sep 15, 2025
Current: 27How to use
Not supported in Firefox, Firefox Android. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN — see the links below.
Feature detection
There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.
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 |
|---|---|---|---|---|---|---|---|
| <anchor-size>.is_animatable | 125 | 125 | ✕ | 26 | 125 | ✕ | 26 |
| <anchor>.is_animatable | 125 | 125 | ✕ | 26 | 125 | ✕ | 26 |