Can I use
?

Ruby annotation

- LS

Method of adding pronunciation or other annotations using ruby elements (primarily used in East Asian typography).

Chrome

  1. 4: Not supported (but has polyfill available)
  2. 5 - 123: Partial support
  3. 124: Partial support
  4. 125 - 127: Partial support

Edge

  1. 12 - 122: Partial support
  2. 123: Partial support

Safari

  1. 3.1 - 4: Not supported (but has polyfill available)
  2. 5 - 17.3: Partial support
  3. 17.4: Partial support
  4. 17.5 - TP: Partial support

Firefox

  1. 2 - 37: Not supported (but has polyfill available)
  2. 38 - 124: Supported
  3. 125: Supported
  4. 126 - 128: Supported

Opera

  1. 9 - 12.1: Not supported (but has polyfill available)
  2. 15 - 108: Partial support
  3. 109: Partial support

IE

  1. 5.5 - 8: Partial support
  2. 9 - 10: Partial support
  3. 11: Partial support

Chrome for Android

  1. 123: Partial support

Safari on iOS

  1. 3.2 - 4.3: Not supported (but has polyfill available)
  2. 5 - 17.3: Partial support
  3. 17.4: Partial support
  4. 17.5: Partial support

Samsung Internet

  1. 4 - 23: Partial support
  2. 24: Partial support

Opera Mini

  1. all: Not supported (but has polyfill available)

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 80: Partial support

UC Browser for Android

  1. 15.5: Partial support

Android Browser

  1. 2.1 - 2.3: Not supported (but has polyfill available)
  2. 3 - 4.4.4: Partial support
  3. 123: Partial support

Firefox for Android

  1. 124: Supported

QQ Browser

  1. 14.9: Partial support

Baidu Browser

  1. 13.52: Partial support

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported

Browsers without native support can still simulate support using CSS. Partial support refers to only supporting basic ruby, may still be missing writing-mode, Complex ruby and CSS3 Ruby.

Resources:
HTML5 Doctor article
WebPlatform Docs
CSS specification