const
- OTHERDeclares a constant with block level scope
IE
- 5.5 - 10: Not supported
- 11: Partial support
Edge
- 12 - 86: Supported
- 87: Supported
Firefox
- 2 - 12: Partial support
- 13 - 35: Partial support
- 36 - 83: Supported
- 84: Supported
- 85 - 86: Supported
Chrome
- 4 - 20: Partial support
- 21 - 40: Partial support
- 41 - 48: Partial support
- 49 - 86: Supported
- 87: Supported
- 88 - 90: Supported
Safari
- 3.1 - 5: Partial support
- 5.1 - 9.1: Partial support
- 10 - 13.1: Supported
- 14: Supported
- TP: Supported
Opera
- 9 - 9.6: Not supported
- 10 - 11.5: Partial support
- 11.6 - 12.1: Partial support
- 15 - 27: Partial support
- 28 - 35: Partial support
- 36 - 71: Supported
- 72: Supported
iOS Safari
- 3.2 - 4.3: Partial support
- 5 - 9.3: Partial support
- 10 - 13.7: Supported
- 14: Supported
Opera Mini
- all: Partial support
Android Browser
- 2.1 - 2.2: Support unknown
- 2.3: Partial support
- 3 - 4.4.4: Partial support
- 81: Supported
Opera Mobile
- 10 - 11.5: Partial support
- 12 - 12.1: Partial support
- 59: Supported
Chrome for Android
- 87: Supported
Firefox for Android
- 83: Supported
UC Browser for Android
- 12.12: Supported
Samsung Internet
- 4: Partial support
- 5 - 12.0: Supported
- 13.0: Supported
QQ Browser
- 10.4: Supported
Baidu Browser
- 7.12: Partial support
KaiOS Browser
- 2.5: Supported