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).

IE

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

Edge

  1. 12 - 15: Partial support
  2. 16 - 85: Supported
  3. 86: Supported

Firefox

  1. 2 - 18: Not supported
  2. 19 - 80: Supported
  3. 81: Supported
  4. 82 - 83: Supported

Chrome

  1. 4 - 19: Not supported
  2. 20 - 25: Partial support
  3. 26 - 85: Supported
  4. 86: Supported
  5. 87 - 89: Supported

Safari

  1. 3.1 - 5.1: Not supported
  2. 6: Partial support
  3. 6.1 - 13.1: Supported
  4. 14: Supported
  5. TP: Supported

Opera

  1. 9 - 12.1: Not supported
  2. 15 - 70: Supported
  3. 71: Supported

iOS Safari

  1. 3.2 - 5.1: Not supported
  2. 6: Partial support
  3. 7: Partial support
  4. 8 - 13.7: Supported
  5. 14: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 81: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Supported

Opera Mobile

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

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Supported

IE Mobile

  1. 10: Partial support
  2. 11: Partial support

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 11.2: Supported
  2. 12.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported
Resources:
Back-Forward issue blog post
Blog post
Buggyfill - Polyfill that fixes buggy support
Polyfill
Microsoft Edge feature request on UserVoice