Can I use
?

::first-letter CSS pseudo-element selector

- REC

CSS pseudo-element that allows styling only the first "letter" of text within an element. Useful for implementing initial caps or drop caps styling.

Chrome

  1. 4: Partial support
  2. 5 - 8: Support unknown
  3. 9 - 116: Supported
  4. 117: Supported
  5. 118 - 120: Supported

Edge

  1. 12 - 116: Supported
  2. 117: Supported

Safari

  1. 3.1: Support unknown
  2. 3.2 - 4: Partial support
  3. 5: Support unknown
  4. 5.1 - 16.6: Supported
  5. 17.0: Supported
  6. 17.1 - TP: Supported

Firefox

  1. 2: Partial support
  2. 3: Partial support
  3. 3.5 - 116: Supported
  4. 117: Supported
  5. 118 - 120: Supported

Opera

  1. 9 - 9.6: Support unknown
  2. 10 - 11.5: Partial support
  3. 11.6 - 101: Supported
  4. 102: Supported

IE

  1. 5.5: Support unknown
  2. 6 - 7: Partial support
  3. 8: Partial support
  4. 9 - 10: Supported
  5. 11: Supported

Chrome for Android

  1. 117: Supported

Safari on iOS

  1. 3.2 - 4.3: Support unknown
  2. 5 - 16.6: Supported
  3. 17.0: Supported
  4. 17.1: Supported

Samsung Internet

  1. 4 - 21: Supported
  2. 22: Supported

Opera Mini

  1. all: Supported

Opera Mobile

  1. 10 - 11.5: Partial support
  2. 12 - 12.1: Supported
  3. 73: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 2.2: Support unknown
  2. 2.3: Partial support
  3. 3 - 4.4.4: Supported
  4. 117: Supported

Firefox for Android

  1. 117: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported

The spec says that both letters of digraphs which are always capitalized together (such as "IJ" in Dutch) should be matched by ::first-letter, but no browser has ever implemented this.

Resources:
MDN Web Docs - :first-letter