Can I use
?

CSS Backdrop Filter

- UNOFF

Method of applying filter effects (like blur, grayscale or hue) to content/elements below the target element.

IE

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

Edge

  1. 12 - 16: Not supported
  2. 17 - 18: Supported
  3. 79 - 85: Supported
  4. 86: Supported

Firefox

  1. 2 - 69: Not supported
  2. 70 - 80: Disabled by default
  3. 81: Disabled by default
  4. 82 - 83: Disabled by default

Chrome

  1. 4 - 46: Not supported
  2. 47 - 75: Disabled by default
  3. 76 - 85: Supported
  4. 86: Supported
  5. 87 - 89: Supported

Safari

  1. 3.1 - 8: Not supported
  2. 9 - 13.1: Supported
  3. 14: Supported
  4. TP: Supported

Opera

  1. 9 - 33: Not supported
  2. 34 - 63: Disabled by default
  3. 64 - 70: Supported
  4. 71: Supported

iOS Safari

  1. 3.2 - 8.4: Not supported
  2. 9 - 13.7: Supported
  3. 14: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 81: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 59: Supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Disabled by default

IE Mobile

  1. 10: Not supported
  2. 11: Not supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4: Not supported
  2. 5 - 11.2: Disabled by default
  3. 12.0: Supported

QQ Browser

  1. 10.4: Disabled by default

Baidu Browser

  1. 7.12: Disabled by default

KaiOS Browser

  1. 2.5: Not supported
Resources:
Blog post
MDN Web Docs - CSS backdrop filter
Edge feature request