Promises
- OTHERA promise represents the eventual result of an asynchronous operation.
Chrome
- 4 - 31: Not supported (but has polyfill available)
- 32: Partial support
- 33 - 123: Supported
- 124: Supported
- 125 - 127: Supported
Edge
- 12 - 123: Supported
- 124: Supported
Safari
- 3.1 - 7: Not supported (but has polyfill available)
- 7.1 - 17.3: Supported
- 17.4: Supported
- 17.5 - TP: Supported
Firefox
- 2 - 26: Not supported (but has polyfill available)
- 27 - 28: Partial support
- 29 - 124: Supported
- 125: Supported
- 126 - 128: Supported
Opera
- 9 - 18: Not supported (but has polyfill available)
- 19: Partial support
- 20 - 108: Supported
- 109: Supported
IE
- 5.5 - 10: Not supported (but has polyfill available)
- 11: Not supported (but has polyfill available)
Chrome for Android
- 124: Supported
Safari on iOS
- 3.2 - 7.1: Not supported (but has polyfill available)
- 8 - 17.3: Supported
- 17.4: Supported
- 17.5: Supported
Samsung Internet
- 4 - 23: Supported
- 24: Supported
Opera Mini
- all: Not supported (but has polyfill available)
Opera Mobile
- 10 - 12.1: Not supported (but has polyfill available)
- 80: Supported
UC Browser for Android
- 15.5: Supported
Android Browser
- 2.1 - 4.4: Not supported (but has polyfill available)
- 4.4.3: Supported
- 124: Supported
Firefox for Android
- 125: Supported
QQ Browser
- 14.9: Supported
Baidu Browser
- 13.52: Supported
KaiOS Browser
- 2.5: Supported
- 3: Supported