unhandledrejection/rejectionhandled events

- LS

The unhandledrejection event is fired when a Promise is rejected but there is no rejection handler to deal with the rejection. The rejectionhandled event is fired when a Promise is rejected, and after the rejection is handled by the promise's rejection handling code.

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79 - 84: Supported
  3. 85: Supported

Firefox

  1. 2 - 68: Not supported
  2. 69 - 79: Supported
  3. 80: Supported
  4. 81 - 82: Supported

Chrome

  1. 4 - 48: Not supported
  2. 49 - 84: Supported
  3. 85: Supported
  4. 86 - 88: Supported

Safari

  1. 3.1 - 10.1: Not supported
  2. 11 - 13.1: Supported
  3. 14: Supported
  4. TP: Supported

Opera

  1. 9 - 35: Not supported
  2. 36 - 69: Supported
  3. 70: Supported

iOS Safari

  1. 3.2 - 10.3: Not supported
  2. 11: Support unknown
  3. 11.3 - 13.7: Supported
  4. 14.0: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 81: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Supported

Chrome for Android

  1. 85: Supported

Firefox for Android

  1. 79: Supported

IE Mobile

  1. 10: Not supported
  2. 11: Not supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4: Not supported
  2. 5 - 11.2: Supported
  3. 12.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Not supported

KaiOS Browser

  1. 2.5: Not supported
Resources:
MDN article on rejectionhandled
MDN article on unhandledrejection
Polyfill for this feature is available in the core-js library
Chrome sample code