Can I use
?

Element.getBoundingClientRect()

- WD

Method to get the size and position of an element's bounding box, relative to the viewport.

Chrome

  1. ✅ 4 - 134: Supported
  2. ✅ 135: Supported
  3. ✅ 136 - 138: Supported

Edge

  1. ✅ 12 - 18: Supported
  2. ✅ 79 - 134: Supported
  3. ✅ 135: Supported

Safari

  1. ﹖ 3.1 - 3.2: Support unknown
  2. ✅ 4 - 18.3: Supported
  3. ✅ 18.4: Supported
  4. ✅ 18.5 - TP: Supported

Firefox

  1. ❌ 2: Not supported
  2. ◐ 3: Partial support
  3. ◐ 3.5: Partial support
  4. ◐ 3.6: Partial support
  5. ◐ 4 - 11: Partial support
  6. ✅ 12 - 136: Supported
  7. ✅ 137: Supported
  8. ✅ 138 - 140: Supported

Opera

  1. ﹖ 9 - 9.6: Support unknown
  2. ◐ 10 - 10.5: Partial support
  3. ✅ 10.6 - 116: Supported
  4. ✅ 117: Supported

IE

  1. ◐ 5.5 - 7: Partial support
  2. ◐ 8: Partial support
  3. ✅ 9 - 10: Supported
  4. ✅ 11: Supported

Chrome for Android

  1. ✅ 135: Supported

Safari on iOS

  1. ﹖ 3.2: Support unknown
  2. ✅ 4 - 18.3: Supported
  3. ✅ 18.4: Supported
  4. ✅ 18.5: Supported

Samsung Internet

  1. ✅ 4 - 26: Supported
  2. ✅ 27: Supported

Opera Mini

  1. ✅ all: Supported

Opera Mobile

  1. ◐ 10: Partial support
  2. ✅ 11 - 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 - 4.4.4: Supported
  3. ✅ 135: Supported

Firefox for Android

  1. ✅ 137: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ✅ 3: Supported
Resources:
MDN Web Docs - getBoundingClientRect
Microsoft Developer Network