Can I use
?

const

- OTHER

Declares a constant with block level scope

Chrome

  1. ◐ 4 - 20: Partial support
  2. ◐ 21 - 40: Partial support
  3. ◐ 41 - 48: Partial support
  4. ✅ 49 - 136: Supported
  5. ✅ 137: Supported
  6. ✅ 138 - 140: Supported

Edge

  1. ✅ 12 - 136: Supported
  2. ✅ 137: Supported

Safari

  1. ◐ 3.1 - 5: Partial support
  2. ◐ 5.1 - 9.1: Partial support
  3. ◐ 10 - 10.1: Partial support
  4. ✅ 11 - 18.4: Supported
  5. ✅ 18.5: Supported
  6. ✅ 26.0 - TP: Supported

Firefox

  1. ◐ 2 - 12: Partial support
  2. ◐ 13 - 35: Partial support
  3. ✅ 36 - 138: Supported
  4. ✅ 139: Supported
  5. ✅ 140 - 142: Supported

Opera

  1. ❌ 9 - 9.6: Not supported
  2. ◐ 10 - 11.5: Partial support
  3. ◐ 11.6 - 12.1: Partial support
  4. ◐ 15 - 27: Partial support
  5. ◐ 28 - 35: Partial support
  6. ✅ 36 - 116: Supported
  7. ✅ 117: Supported

IE

  1. ❌ 5.5 - 10: Not supported
  2. ◐ 11: Partial support

Chrome for Android

  1. ✅ 137: Supported

Safari on iOS

  1. ◐ 3.2 - 4.3: Partial support
  2. ◐ 5 - 9.3: Partial support
  3. ◐ 10 - 10.3: Partial support
  4. ✅ 11 - 18.4: Supported
  5. ✅ 18.5: Supported
  6. ✅ 26.0: Supported

Samsung Internet

  1. ◐ 4: Partial support
  2. ✅ 5 - 27: Supported
  3. ✅ 28: Supported

Opera Mini

  1. ◐ all: Partial support

Opera Mobile

  1. ◐ 10 - 11.5: Partial support
  2. ◐ 12 - 12.1: Partial support
  3. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ﹖ 2.1 - 2.2: Support unknown
  2. ◐ 2.3: Partial support
  3. ◐ 3 - 4.4.4: Partial support
  4. ✅ 137: Supported

Firefox for Android

  1. ✅ 139: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ✅ 3: Supported
Resources:
MDN Web Docs - const
Variables and Constants in ES6