let
- OTHERDeclares a variable with block level scope
Chrome
- 4 - 18: Not supported
- 19 - 40: Disabled by default
- 41 - 48: Partial support
- 49 - 118: Supported
- 119: Supported
- 120 - 122: Supported
Edge
- 12 - 118: Supported
- 119: Supported
Safari
- 3.1 - 9.1: Not supported
- 10 - 10.1: Partial support
- 11 - 17.0: Supported
- 17.1: Supported
- 17.2 - TP: Supported
Firefox
- 2 - 43: Disabled by default
- 44 - 119: Supported
- 120: Supported
- 121 - 123: Supported
Opera
- 9 - 12.1: Not supported
- 15 - 27: Disabled by default
- 28 - 35: Partial support
- 36 - 103: Supported
- 104: Supported
IE
- 5.5 - 10: Not supported
- 11: Partial support
Chrome for Android
- 119: Supported
Safari on iOS
- 3.2 - 9.3: Not supported
- 10 - 10.3: Partial support
- 11 - 17.0: Supported
- 17.1: Supported
- 17.2: Supported
Samsung Internet
- 4: Partial support
- 5 - 22: Supported
- 23: Supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 73: Supported
UC Browser for Android
- 15.5: Supported
Android Browser
- 2.1 - 4.4.4: Not supported
- 119: Supported
Firefox for Android
- 119: Supported
QQ Browser
- 13.1: Supported
Baidu Browser
- 13.18: Supported
KaiOS Browser
- 2.5: Supported
- 3: Supported