Can I use
?

CSS Reflections

- UNOFF

Method of displaying a reflection of an element

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79 - 90: Supported
  3. 91: Supported

Firefox

  1. 2 - 88: Not supported
  2. 89: Not supported
  3. 90 - 91: Not supported

Chrome

  1. 4 - 90: Supported
  2. 91: Supported
  3. 92 - 94: Supported

Safari

  1. 3.1 - 3.2: Not supported
  2. 4 - 14: Supported
  3. 14.1: Supported
  4. 15 - TP: Supported

Opera

  1. 9 - 12.1: Not supported
  2. 15 - 75: Supported
  3. 76: Supported

Safari on iOS

  1. 3.2 - 14.4: Supported
  2. 14.5: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Supported
  2. 91: Supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 62: Supported

Chrome for Android

  1. 91: Supported

Firefox for Android

  1. 89: Not supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4 - 13.0: Supported
  2. 14.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Not supported

Similar effect can be achieved in Firefox 4+ using the -moz-element() background property

Resources:
WebKit blog post
Microsoft Edge feature request on UserVoice