unhandledrejection/rejectionhandled events

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.

Chrome

❌ 4 - 48: Not supported
✅ 49 - 130: Supported
✅ 131: Supported
✅ 132 - 134: Supported

Edge

❌ 12 - 18: Not supported
✅ 79 - 130: Supported
✅ 131: Supported

Safari

❌ 3.1 - 10.1: Not supported
✅ 11 - 18.0: Supported
✅ 18.1: Supported
✅ 18.2 - TP: Supported

Firefox

❌ 2 - 68: Not supported
✅ 69 - 131: Supported
✅ 132: Supported
✅ 133 - 135: Supported

Opera

❌ 9 - 35: Not supported
✅ 36 - 113: Supported
✅ 114: Supported

IE

❌ 5.5 - 10: Not supported
❌ 11: Not supported

Chrome for Android

✅ 131: Supported

Safari on iOS

❌ 3.2 - 10.3: Not supported
﹖ 11: Support unknown
✅ 11.3 - 18.0: Supported
✅ 18.1: Supported
✅ 18.2: Supported

Samsung Internet

❌ 4: Not supported
✅ 5 - 25: Supported
✅ 26: Supported

Opera Mini

❌ all: Not supported

Opera Mobile

❌ 10 - 12.1: Not supported
✅ 80: Supported

UC Browser for Android

✅ 15.5: Supported

Android Browser

❌ 2.1 - 4.4.4: Not supported
✅ 131: Supported

Firefox for Android

✅ 132: Supported

QQ Browser

✅ 14.9: Supported

Baidu Browser

✅ 13.52: Supported

KaiOS Browser

❌ 2.5: Not supported
✅ 3: Supported

Resources:: MDN article on rejectionhandled; MDN article on unhandledrejection; Polyfill for this feature is available in the core-js library; Chrome sample code