Custom Elements (deprecated V0 spec)
- UNOFFOriginal V0 version of the custom elements specification. See Custom Elements V1 for support for the latest version.
Chrome
- ❌ 4 - 26: Not supported
- ❌ 27 - 32: Disabled by default
- ✅ 33 - 79: Supported
- ❌ 80 - 142: Not supported
- ❌ 143: Not supported
- ❌ 144 - 146: Not supported
Edge
- ❌ 12 - 18: Not supported (but has polyfill available)
- ✅ 79: Supported
- ❌ 80 - 142: Not supported
- ❌ 143: Not supported
Safari
- ❌ 3.1 - 5.1: Not supported
- ❌ 6 - 26.1: Not supported (but has polyfill available)
- ❌ 26.2: Not supported (but has polyfill available)
- ❌ TP: Not supported (but has polyfill available)
Firefox
- ❌ 2 - 22: Not supported
- ❌ 23 - 29: Disabled by default
- ❌ 30 - 58: Disabled by default
- ❌ 59 - 144: Not supported
- ❌ 145: Not supported
- ❌ 146 - 148: Not supported
Opera
- ❌ 9 - 12.1: Not supported
- ❌ 15 - 19: Disabled by default
- ✅ 20 - 66: Supported
- ❌ 67 - 121: Not supported
- ❌ 122: Not supported
IE
- ❌ 5.5 - 9: Not supported
- ❌ 10: Not supported (but has polyfill available)
- ❌ 11: Not supported (but has polyfill available)
Chrome for Android
- ❌ 142: Not supported
Safari on iOS
- ❌ 3.2 - 6.1: Not supported
- ❌ 7 - 18.7: Not supported (but has polyfill available)
- ❌ 26.0: Not supported (but has polyfill available)
- ❌ 26.1: Not supported (but has polyfill available)
Samsung Internet
- ✅ 4 - 12.0: Supported
- ❌ 13.0 - 28: Not supported
- ❌ 29: Not supported
Opera Mini
- ❌ all: Not supported
Opera Mobile
- ❌ 10 - 12.1: Not supported
- ❌ 80: Not supported
UC Browser for Android
- ✅ 15.5: Supported
Android Browser
- ❌ 2.1 - 4.4: Not supported
- ✅ 4.4.3: Supported
- ❌ 142: Not supported
Firefox for Android
- ❌ 144: Not supported
QQ Browser
- ✅ 14.9: Supported
Baidu Browser
- ❌ 13.52: Not supported
KaiOS Browser
- ❌ 2.5: Disabled by default
- ❌ 3: Not supported
- Resources:
- Blog post on upgrading from V0 to V1