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 - 150: Partial support
  4. 151 - 153: Partial support
  5. 154: Partial support
  6. 155 - 157: Partial support

Edge

  1. 12 - 116: Not supported
  2. 117 - 124: Disabled by default
  3. 125 - 150: Partial support
  4. 151: Partial support
  5. 152: Partial support

Safari

  1. 3.1 - 18.7: Not supported
  2. 26.0 - 26.6: Partial support
  3. 27: Supported
  4. 27.1 - TP: Supported

Firefox

  1. 2 - 144: Not supported
  2. 145 - 146: Disabled by default
  3. 147 - 150: Partial support
  4. 151 - 155: Partial support
  5. 156: Partial support
  6. 157 - 159: Partial support

Opera

  1. 9 - 102: Not supported
  2. 103 - 110: Disabled by default
  3. 111 - 134: Partial support
  4. 135: Partial support

IE

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

Chrome for Android

  1. 152: Partial support

Safari on iOS

  1. 3.2 - 18.7: Not supported
  2. 26.0 - 26.6: Partial support
  3. 27.0: Supported
  4. 27.1 - 27.2: Supported

Samsung Internet

  1. 4 - 26: Not supported
  2. 27 - 29: Partial support
  3. 30: Partial support

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. 152: Partial support

Firefox for Android

  1. 156: Partial support

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