CustomEvent
- LSA DOM event interface that can carry custom application-defined data.
Chrome
- 4: Not supported
- 5 - 8: Support unknown
- 9 - 12: Partial support
- 13 - 14: Support unknown
- 15 - 116: Supported
- 117: Supported
- 118 - 120: Supported
Edge
- 12 - 116: Supported
- 117: Supported
Safari
- 3.1 - 4: Not supported
- 5: Support unknown
- 5.1: Partial support
- 6: Support unknown
- 6.1 - 16.5: Supported
- 16.6: Supported
- 17.0 - TP: Supported
Firefox
- 2 - 5: Not supported
- 6 - 10: Partial support
- 11 - 116: Supported
- 117: Supported
- 118 - 120: Supported
Opera
- 9 - 10.6: Not supported
- 11 - 11.5: Partial support
- 11.6 - 101: Supported
- 102: Supported
IE
- 5.5 - 8: Not supported
- 9 - 10: Partial support
- 11: Partial support
Chrome for Android
- 117: Supported
Safari on iOS
- 3.2: Support unknown
- 4: Not supported
- 4.2: Support unknown
- 5: Partial support
- 6 - 16.6: Supported
- 17.0: Supported
- 17.1: Supported
Samsung Internet
- 4 - 21: Supported
- 22: Supported
Opera Mini
- all: Supported
Opera Mobile
- 10: Not supported
- 11 - 11.5: Partial support
- 12 - 12.1: Supported
- 73: Supported
UC Browser for Android
- 15.5: Supported
Android Browser
- 2.1 - 2.3: Not supported
- 3 - 4.3: Partial support
- 4.4 - 4.4.4: Supported
- 117: Supported
Firefox for Android
- 117: Supported
QQ Browser
- 13.1: Supported
Baidu Browser
- 13.18: Supported
KaiOS Browser
- 2.5: Supported
- 3: Supported
Not supported in some versions of Android's old WebKit-based WebView.