Can I use
?

CSS3 attr() function for all properties

- UNOFF

While attr() is supported for effectively all browsers for the content property, CSS Values and Units Level 5 adds the ability to use attr() on any CSS property, and to use it for non-string values (e.g. numbers, colors).

Chrome

  1. ❌ 4 - 132: Not supported
  2. ✅ 133 - 136: Supported
  3. ✅ 137: Supported
  4. ✅ 138 - 140: Supported

Edge

  1. ❌ 12 - 132: Not supported
  2. ✅ 133 - 136: Supported
  3. ✅ 137: Supported

Safari

  1. ❌ 3.1 - 18.4: Not supported
  2. ❌ 18.5: Not supported
  3. ❌ 26.0 - TP: Not supported

Firefox

  1. ❌ 2 - 138: Not supported
  2. ❌ 139: Not supported
  3. ❌ 140 - 142: Not supported

Opera

  1. ❌ 9 - 116: Not supported
  2. ❌ 117: Not supported

IE

  1. ❌ 5.5 - 10: Not supported
  2. ❌ 11: Not supported

Chrome for Android

  1. ✅ 137: Supported

Safari on iOS

  1. ❌ 3.2 - 18.4: Not supported
  2. ❌ 18.5: Not supported
  3. ❌ 26.0: Not supported

Samsung Internet

  1. ❌ 4 - 27: Not supported
  2. ❌ 28: Not supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 12.1: Not supported
  2. ❌ 80: Not supported

UC Browser for Android

  1. ❌ 15.5: Not supported

Android Browser

  1. ❌ 2.1 - 4.4.4: Not supported
  2. ✅ 137: Supported

Firefox for Android

  1. ❌ 139: Not supported

QQ Browser

  1. ❌ 14.9: Not supported

Baidu Browser

  1. ❌ 13.52: Not supported

KaiOS Browser

  1. ❌ 2.5: Not supported
  2. ❌ 3: Not supported

See the generated content table for support for attr() for the content property.

Resources:
Chromium issue #246571: Implement CSS3 attribute / attr references
WebKit Bug #26609: Support CSS3 attr() function
Mozilla Bug #435426: implement css3-values extensions to `attr()`
MDN Web Docs - CSS attr