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 - 149: Supported
  4. ✅ 150: Supported
  5. ✅ 151 - 153: Supported

Edge

  1. ✅ 12 - 149: Supported
  2. ✅ 150: Supported

Safari

  1. ﹖ 3.1: Support unknown
  2. ◐ 3.2 - 4: Partial support
  3. ﹖ 5: Support unknown
  4. ✅ 5.1 - 26.3: Supported
  5. ✅ 26.4: Supported
  6. ✅ 26.5 - TP: Supported

Firefox

  1. ◐ 2: Partial support
  2. ◐ 3: Partial support
  3. ✅ 3.5 - 151: Supported
  4. ✅ 152: Supported
  5. ✅ 153 - 155: Supported

Opera

  1. ﹖ 9 - 9.6: Support unknown
  2. ◐ 10 - 11.5: Partial support
  3. ✅ 11.6 - 127: Supported
  4. ✅ 131: 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. ✅ 150: Supported

Safari on iOS

  1. ﹖ 3.2 - 4.3: Support unknown
  2. ✅ 5 - 26.3: Supported
  3. ✅ 26.4: Supported
  4. ✅ 26.5: Supported

Samsung Internet

  1. ✅ 4 - 29: Supported
  2. ✅ 30: Supported

Opera Mini

  1. ✅ all: Supported

Opera Mobile

  1. ◐ 10 - 11.5: Partial support
  2. ✅ 12 - 12.1: Supported
  3. ✅ 80: 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. ✅ 150: Supported

Firefox for Android

  1. ✅ 152: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: 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