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 - 123: Supported
  5. 124: Supported
  6. 125 - 127: Supported

Edge

  1. 12 - 122: Supported
  2. 123: Supported

Safari

  1. 3.1 - 5: Partial support
  2. 5.1 - 9.1: Partial support
  3. 10 - 10.1: Partial support
  4. 11 - 17.3: Supported
  5. 17.4: Supported
  6. 17.5 - TP: Supported

Firefox

  1. 2 - 12: Partial support
  2. 13 - 35: Partial support
  3. 36 - 124: Supported
  4. 125: Supported
  5. 126 - 128: 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 - 108: Supported
  7. 109: Supported

IE

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

Chrome for Android

  1. 123: 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 - 17.3: Supported
  5. 17.4: Supported
  6. 17.5: Supported

Samsung Internet

  1. 4: Partial support
  2. 5 - 23: Supported
  3. 24: 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. 123: Supported

Firefox for Android

  1. 124: 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