HTML Imports
- WDDeprecated method of including and reusing HTML documents in other HTML documents. Superseded by ES modules.
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 - 102: Not supported
- 103: Not supported
Firefox
- 2 - 29: Not supported
- 30 - 31: Not supported (but has polyfill available)
- 32 - 55: Disabled by default
- 56 - 101: Not supported (but has polyfill available)
- 102: Not supported (but has polyfill available)
- 103 - 104: Not supported (but has polyfill available)
Chrome
- 4 - 29: Not supported
- 30 - 34: Disabled by default
- 35: Disabled by default
- 36 - 79: Supported
- 80 - 102: Not supported
- 103: Not supported
- 104 - 106: Not supported
Safari
- 3.1 - 5.1: Not supported
- 6 - 15.4: Not supported (but has polyfill available)
- 15.5: Not supported (but has polyfill available)
- 16.0 - TP: Not supported (but has polyfill available)
Opera
- 9 - 16: Not supported
- 17 - 21: Disabled by default
- 22: Disabled by default
- 23 - 66: Supported
- 67 - 85: Not supported
- 86: Not supported
- 87: Not supported
Safari on iOS
- 3.2 - 6.1: Not supported
- 7 - 15.4: Not supported (but has polyfill available)
- 15.5: Not supported (but has polyfill available)
- 16.0: Not supported (but has polyfill available)
Opera Mini
- all: Not supported
Android Browser
- 2.1 - 4.4.4: Not supported
- 103: Not supported
Opera Mobile
- 10 - 12.1: Not supported
- 64: Not supported
Chrome for Android
- 103: Not supported
Firefox for Android
- 101: Not supported (but has polyfill available)
UC Browser for Android
- 12.12: Supported
Samsung Internet
- 4 - 12.0: Supported
- 13.0 - 16.0: Not supported
- 17.0: Not supported
QQ Browser
- 10.4: Supported
Baidu Browser
- 7.12: Supported
KaiOS Browser
- 2.5: Supported