Custom Elements (deprecated V0 spec)
- UNOFFOriginal V0 version of the custom elements specification. See Custom Elements V1 for support for the latest version.
IE
- 5.5 - 9: Not supported
- 10: Not supported (but has polyfill available)
- 11: Not supported (but has polyfill available)
Edge
- 12 - 18: Not supported (but has polyfill available)
- 79: Supported
- 80 - 93: Not supported
- 94: Not supported
Firefox
- 2 - 22: Not supported
- 23 - 29: Disabled by default
- 30 - 58: Disabled by default
- 59 - 92: Not supported
- 93: Not supported
- 94 - 95: Not supported
Chrome
- 4 - 26: Not supported
- 27 - 32: Disabled by default
- 33 - 79: Supported
- 80 - 93: Not supported
- 94: Not supported
- 95 - 97: Not supported
Safari
- 3.1 - 5.1: Not supported
- 6 - 14.1: Not supported (but has polyfill available)
- 15: Not supported (but has polyfill available)
- TP: Not supported (but has polyfill available)
Opera
- 9 - 12.1: Not supported
- 15 - 19: Disabled by default
- 20 - 66: Supported
- 67 - 79: Not supported
- 80: Not supported
Safari on iOS
- 3.2 - 6.1: Not supported
- 7 - 14.8: Not supported (but has polyfill available)
- 15: Not supported (but has polyfill available)
Opera Mini
- all: Not supported
Android Browser
- 2.1 - 4.4: Not supported
- 4.4.3: Supported
- 94: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 64: Not supported
Chrome for Android
- 94: Not supported
Firefox for Android
- 92: Not supported
UC Browser for Android
- 12.12: Supported
Samsung Internet
- 4 - 12.0: Supported
- 13.0 - 14.0: Not supported
- 15.0: Not supported
QQ Browser
- 10.4: Supported
Baidu Browser
- 7.12: Supported
KaiOS Browser
- 2.5: Disabled by default