Can I use
?

Viewport units: vw, vh, vmin, vmax

- CR

Length units representing a percentage of the current viewport dimensions: width (vw), height (vh), the smaller of the two (vmin), or the larger of the two (vmax).

Chrome

  1. 4 - 19: Not supported
  2. 20 - 25: Partial support
  3. 26 - 116: Supported
  4. 117: Supported
  5. 118 - 120: Supported

Edge

  1. 12 - 15: Partial support
  2. 16 - 116: Supported
  3. 117: Supported

Safari

  1. 3.1 - 5.1: Not supported
  2. 6: Partial support
  3. 6.1 - 16.5: Supported
  4. 16.6: Supported
  5. 17.0 - TP: Supported

Firefox

  1. 2 - 18: Not supported
  2. 19 - 116: Supported
  3. 117: Supported
  4. 118 - 120: Supported

Opera

  1. 9 - 12.1: Not supported
  2. 15 - 101: Supported
  3. 102: Supported

IE

  1. 5.5 - 8: Not supported
  2. 9: Partial support
  3. 10: Partial support
  4. 11: Partial support

Chrome for Android

  1. 117: Supported

Safari on iOS

  1. 3.2 - 5.1: Not supported
  2. 6: Partial support
  3. 7: Partial support
  4. 8 - 16.6: Supported
  5. 17.0: Supported
  6. 17.1: Supported

Samsung Internet

  1. 4 - 21: Supported
  2. 22: Supported

Opera Mini

  1. all: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 73: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 117: Supported

Firefox for Android

  1. 117: Supported

QQ Browser

  1. 13.1: Supported

Baidu Browser

  1. 13.18: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
Back-Forward issue blog post
Blog post
Buggyfill - Polyfill that fixes buggy support
Polyfill