Can I use
?

Promises

- OTHER

A promise represents the eventual result of an asynchronous operation.

IE

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

Edge

  1. 12 - 86: Supported
  2. 87: Supported

Firefox

  1. 2 - 26: Not supported (but has polyfill available)
  2. 27 - 28: Partial support
  3. 29 - 83: Supported
  4. 84: Supported
  5. 85 - 86: Supported

Chrome

  1. 4 - 31: Not supported (but has polyfill available)
  2. 32: Partial support
  3. 33 - 86: Supported
  4. 87: Supported
  5. 88 - 90: Supported

Safari

  1. 3.1 - 7: Not supported (but has polyfill available)
  2. 7.1 - 13.1: Supported
  3. 14: Supported
  4. TP: Supported

Opera

  1. 9 - 18: Not supported (but has polyfill available)
  2. 19: Partial support
  3. 20 - 71: Supported
  4. 72: Supported

iOS Safari

  1. 3.2 - 7.1: Not supported (but has polyfill available)
  2. 8 - 13.7: Supported
  3. 14: Supported

Opera Mini

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

Android Browser

  1. 2.1 - 4.4: Not supported (but has polyfill available)
  2. 4.4.3: Supported
  3. 81: Supported

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 59: Supported

Chrome for Android

  1. 87: Supported

Firefox for Android

  1. 83: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 12.0: Supported
  2. 13.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

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