CSS Anchor Positioning

- WD

Allows placing elements anywhere on the page relative to an "anchor element", without regard to the layout of other elements besides their containing block

Chrome

  1. 4 - 116: Not supported
  2. 117 - 124: Disabled by default
  3. 125: Supported
  4. 126 - 128: Supported

Edge

  1. 12 - 116: Not supported
  2. 117 - 124: Disabled by default
  3. 125: Supported

Safari

  1. 3.1 - 17.4: Not supported
  2. 17.5: Not supported
  3. 17.6 - TP: Not supported

Firefox

  1. 2 - 125: Not supported
  2. 126: Not supported
  3. 127 - 129: Not supported

Opera

  1. 9 - 102: Not supported
  2. 103 - 108: Disabled by default
  3. 109: Disabled by default

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Chrome for Android

  1. 125: Supported

Safari on iOS

  1. 3.2 - 17.4: Not supported
  2. 17.5: Not supported
  3. 17.6: Not supported

Samsung Internet

  1. 4 - 23: Not supported
  2. 24: Not supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 80: Not supported

UC Browser for Android

  1. 15.5: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 125: Supported

Firefox for Android

  1. 126: Not supported

QQ Browser

  1. 14.9: Not supported

Baidu Browser

  1. 13.52: Not supported

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Not supported
Resources:
Blog post
Firefox support bug
Blog post on usage
Polyfill
WebKit position on Anchor Positioning