Can I use
?

background-position-x & background-position-y

- UNOFF

CSS longhand properties to define x or y positions separately.

Chrome

  1. ✅ 4 - 146: Supported
  2. ✅ 147: Supported
  3. ✅ 148 - 150: Supported

Edge

  1. ✅ 12 - 145: Supported
  2. ✅ 146: Supported

Safari

  1. ✅ 3.1 - 26.3: Supported
  2. ✅ 26.4: Supported
  3. ✅ 26.5 - TP: Supported

Firefox

  1. ❌ 2 - 48: Not supported
  2. ✅ 49 - 148: Supported
  3. ✅ 149: Supported
  4. ✅ 150 - 152: Supported

Opera

  1. ❌ 9 - 12.1: Not supported
  2. ✅ 15 - 126: Supported
  3. ✅ 127: Supported

IE

  1. ✅ 5.5 - 10: Supported
  2. ✅ 11: Supported

Chrome for Android

  1. ✅ 147: Supported

Safari on iOS

  1. ✅ 3.2 - 26.3: Supported
  2. ✅ 26.4: Supported
  3. ✅ 26.5: Supported

Samsung Internet

  1. ✅ 4 - 28: Supported
  2. ✅ 29: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

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

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ✅ 2.1 - 4.4.4: Supported
  2. ✅ 147: Supported

Firefox for Android

  1. ✅ 149: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

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

A workaround for the lack of support in Firefox 31 - Firefox 48 is to use CSS variables. See this Stack Overflow answer for an example.

Resources:
Firefox implementation bug
MDN Web Docs - background-position-x
MDN Web Docs - background-position-y
Blog post on background-position-x & y properties