Can I use
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CSS Generated content for pseudo-elements

- REC

Method of displaying text or images before or after the given element's contents using the ::before and ::after pseudo-elements. All browsers with support also support the attr() notation in the content property.

IE

  1. 5.5 - 7: Not supported
  2. 8: Partial support
  3. 9 - 10: Supported
  4. 11: Supported

Edge

  1. 12 - 100: Supported
  2. 101: Supported

Firefox

  1. 2 - 99: Supported
  2. 100: Supported
  3. 101 - 102: Supported

Chrome

  1. 4 - 100: Supported
  2. 101: Supported
  3. 102 - 104: Supported

Safari

  1. 3.1 - 15.3: Supported
  2. 15.4: Supported
  3. TP: Supported

Opera

  1. 9 - 85: Supported
  2. 86: Supported
  3. 87: Supported

Safari on iOS

  1. 3.2 - 15.3: Supported
  2. 15.4: Supported

Opera Mini

  1. all: Supported

Android Browser

  1. 2.1 - 4.4.4: Supported
  2. 101: Supported

Opera Mobile

  1. 10 - 12.1: Supported
  2. 64: Supported

Chrome for Android

  1. 101: Supported

Firefox for Android

  1. 100: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 15.0: Supported
  2. 16.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

For content to appear in pseudo-elements, the content property must be set (but may be an empty string).

Resources:
Guide on usage
Dev.Opera article
WebPlatform Docs