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 - 155: Supported
  4. ✅ 156: Supported
  5. ✅ 157 - 159: Supported

Edge

  1. ◐ 12 - 15: Partial support
  2. ✅ 16 - 154: Supported
  3. ✅ 155: Supported

Safari

  1. ❌ 3.1 - 5.1: Not supported
  2. ◐ 6: Partial support
  3. ✅ 6.1 - 26.6: Supported
  4. ✅ 27: Supported
  5. ✅ 27.1 - TP: Supported

Firefox

  1. ❌ 2 - 18: Not supported
  2. ✅ 19 - 158: Supported
  3. ✅ 159: Supported
  4. ✅ 160 - 162: Supported

Opera

  1. ❌ 9 - 12.1: Not supported
  2. ✅ 15 - 134: Supported
  3. ✅ 135: Supported

IE

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

Chrome for Android

  1. ✅ 156: Supported

Safari on iOS

  1. ❌ 3.2 - 5.1: Not supported
  2. ◐ 6: Partial support
  3. ◐ 7: Partial support
  4. ✅ 8 - 26.6: Supported
  5. ✅ 27.0: Supported
  6. ✅ 27.1 - 27.2: Supported

Samsung Internet

  1. ✅ 4 - 29: Supported
  2. ✅ 30: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 12.1: Not supported
  2. ✅ 80: 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. ✅ 156: Supported

Firefox for Android

  1. ✅ 159: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: 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