Can I use
?

getComputedStyle

- REC

API to get the current computed CSS styles applied to an element. This may be the current value applied by an animation or as set by a stylesheet.

Chrome

  1. 4 - 10: Partial support
  2. 11 - 108: Supported
  3. 109: Supported
  4. 110 - 112: Supported

Edge

  1. 12 - 108: Supported
  2. 109: Supported

Safari

  1. 3.1 - 4: Partial support
  2. 5 - 16.2: Supported
  3. 16.3: Supported
  4. TP: Supported

Firefox

  1. 2: Not supported
  2. 3 - 3.6: Partial support
  3. 4 - 108: Supported
  4. 109: Supported
  5. 110 - 111: Supported

Opera

  1. 9 - 10.5: Partial support
  2. 10.6 - 91: Supported
  3. 92: Supported

IE

  1. 5.5 - 8: Not supported
  2. 9 - 10: Supported
  3. 11: Supported

Chrome for Android

  1. 109: Supported

Safari on iOS

  1. 3.2 - 4.3: Partial support
  2. 5 - 16.2: Supported
  3. 16.3: Supported

Samsung Internet

  1. 4 - 18.0: Supported
  2. 19.0: Supported

Opera Mini

  1. all: Partial support

Opera Mobile

  1. 10: Partial support
  2. 11 - 12.1: Supported
  3. 72: Supported

UC Browser for Android

  1. 13.4: Supported

Android Browser

  1. 2.1 - 3: Partial support
  2. 4 - 4.4.4: Supported
  3. 109: Supported

Firefox for Android

  1. 107: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
Resources:
MDN Web Docs - getComputedStyle
Polyfill for IE
Demo