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CSS outline properties

- CR

The CSS outline properties draw a border around an element that does not affect layout, making it ideal for highlighting. This covers the outline shorthand, as well as outline-width, outline-style, outline-color and outline-offset.

IE

  1. 5.5 - 7: Not supported
  2. 8: Partial support
  3. 9 - 10: Partial support
  4. 11: Partial support

Edge

  1. 12 - 14: Partial support
  2. 15 - 85: Supported
  3. 86: Supported

Firefox

  1. 2 - 80: Supported
  2. 81: Supported
  3. 82 - 83: Supported

Chrome

  1. 4 - 85: Supported
  2. 86: Supported
  3. 87 - 89: Supported

Safari

  1. 3.1 - 13.1: Supported
  2. 14: Supported
  3. TP: Supported

Opera

  1. 9 - 11.5: Partial support
  2. 11.6 - 12: Supported
  3. 12.1: Supported
  4. 15 - 70: Supported
  5. 71: Supported

iOS Safari

  1. 3.2 - 13.7: Supported
  2. 14: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Supported
  2. 81: Supported

Blackberry Browser

  1. 7: Supported
  2. 10: Supported

Opera Mobile

  1. 10 - 11.5: Partial support
  2. 12 - 12.1: Supported
  3. 59: Supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Supported

IE Mobile

  1. 10: Partial support
  2. 11: Partial support

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 11.2: Supported
  2. 12.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

Firefox also supports the non-standard -moz-outline-radius property that acts similar to border-radius.

Resources:
MDN Web Docs - CSS outline
CSS Basic User Interface Module Level 3