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 - 112: Partial support
  3. 113: Partial support
  4. 114 - 116: Partial support

Edge

  1. 12 - 112: Partial support
  2. 113: Partial support

Safari

  1. 3.1 - 4: Not supported (but has polyfill available)
  2. 5 - 16.4: Partial support
  3. 16.5: Partial support
  4. 16.6 - TP: Partial support

Firefox

  1. 2 - 37: Not supported (but has polyfill available)
  2. 38 - 112: Supported
  3. 113: Supported
  4. 114 - 115: Supported

Opera

  1. 9 - 12.1: Not supported (but has polyfill available)
  2. 15 - 98: Partial support
  3. 99: Partial support

IE

  1. 5.5 - 10: Partial support
  2. 11: Partial support

Chrome for Android

  1. 113: Partial support

Safari on iOS

  1. 3.2 - 4.3: Not supported (but has polyfill available)
  2. 5 - 16.4: Partial support
  3. 16.5: Partial support

Samsung Internet

  1. 4 - 20: Partial support
  2. 21: 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. 73: Partial support

UC Browser for Android

  1. 13.4: Partial support

Android Browser

  1. 2.1 - 2.3: Not supported (but has polyfill available)
  2. 3 - 4.4.4: Partial support
  3. 113: Partial support

Firefox for Android

  1. 113: Supported

QQ Browser

  1. 13.1: Partial support

Baidu Browser

  1. 13.18: 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