Promises

- OTHER

A promise represents the eventual result of an asynchronous operation.

Chrome

  1. 4 - 31: Not supported (but has polyfill available)
  2. 32: Partial support
  3. 33 - 124: Supported
  4. 125: Supported
  5. 126 - 128: Supported

Edge

  1. 12 - 124: Supported
  2. 125: Supported

Safari

  1. 3.1 - 7: Not supported (but has polyfill available)
  2. 7.1 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6 - TP: Supported

Firefox

  1. 2 - 26: Not supported (but has polyfill available)
  2. 27 - 28: Partial support
  3. 29 - 125: Supported
  4. 126: Supported
  5. 127 - 129: Supported

Opera

  1. 9 - 18: Not supported (but has polyfill available)
  2. 19: Partial support
  3. 20 - 108: Supported
  4. 109: Supported

IE

  1. 5.5 - 10: Not supported (but has polyfill available)
  2. 11: Not supported (but has polyfill available)

Chrome for Android

  1. 124: Supported

Safari on iOS

  1. 3.2 - 7.1: Not supported (but has polyfill available)
  2. 8 - 17.4: Supported
  3. 17.5: Supported
  4. 17.6: Supported

Samsung Internet

  1. 4 - 23: Supported
  2. 24: Supported

Opera Mini

  1. all: Not supported (but has polyfill available)

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 80: Supported

UC Browser for Android

  1. 15.5: Supported

Android Browser

  1. 2.1 - 4.4: Not supported (but has polyfill available)
  2. 4.4.3: Supported
  3. 124: Supported

Firefox for Android

  1. 125: Supported

QQ Browser

  1. 14.9: Supported

Baidu Browser

  1. 13.52: Supported

KaiOS Browser

  1. 2.5: Supported
  2. 3: Supported
Resources:
A polyfill for ES6-style Promises
Polyfill for this feature is available in the core-js library
Promises/A+ spec
JavaScript Promises: There and back again - HTML5 Rocks