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 - 135: Partial support
  3. ◐ 136: Partial support
  4. ◐ 137 - 139: Partial support

Edge

  1. ◐ 12 - 135: Partial support
  2. ◐ 136: Partial support

Safari

  1. ❌ 3.1 - 4: Not supported (but has polyfill available)
  2. ◐ 5 - 18.4: Partial support
  3. ◐ 18.5: Partial support
  4. ◐ TP: Partial support

Firefox

  1. ❌ 2 - 37: Not supported (but has polyfill available)
  2. ✅ 38 - 137: Supported
  3. ✅ 138: Supported
  4. ✅ 139 - 141: Supported

Opera

  1. ❌ 9 - 12.1: Not supported (but has polyfill available)
  2. ◐ 15 - 116: Partial support
  3. ◐ 117: Partial support

IE

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

Chrome for Android

  1. ◐ 136: Partial support

Safari on iOS

  1. ❌ 3.2 - 4.3: Not supported (but has polyfill available)
  2. ◐ 5 - 18.4: Partial support
  3. ◐ 18.5: Partial support

Samsung Internet

  1. ◐ 4 - 26: Partial support
  2. ◐ 27: 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. ◐ 136: Partial support

Firefox for Android

  1. ✅ 137: 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