Server-sent events
- LSMethod of continuously sending data from a server to the browser, rather than repeatedly requesting it (EventSource interface, used to fall under HTML5)
Chrome
- 4 - 5: Not supported
- 6 - 123: Supported
- 124: Supported
- 125 - 127: Supported
Edge
- 12 - 18: Not supported
- 79 - 123: Supported
- 124: Supported
Safari
- 3.1 - 4: Not supported
- 5 - 17.3: Supported
- 17.4: Supported
- 17.5 - TP: Supported
Firefox
- 2 - 5: Not supported
- 6 - 124: Supported
- 125: Supported
- 126 - 128: Supported
Opera
- 9 - 10.6: Partial support
- 11 - 108: Supported
- 109: Supported
IE
- 5.5 - 10: Not supported
- 11: Not supported
Chrome for Android
- 124: Supported
Safari on iOS
- 3.2: Not supported
- 4 - 17.3: Supported
- 17.4: Supported
- 17.5: Supported
Samsung Internet
- 4 - 23: Supported
- 24: Supported
Opera Mini
- all: Not supported
Opera Mobile
- 10 - 11: Partial support
- 11.1 - 12.1: Supported
- 80: Supported
UC Browser for Android
- 15.5: Supported
Android Browser
- 2.1 - 4.3: Not supported
- 4.4 - 4.4.4: Supported
- 124: Supported
Firefox for Android
- 125: Supported
QQ Browser
- 14.9: Supported
Baidu Browser
- 13.52: Supported
KaiOS Browser
- 2.5: Supported
- 3: Supported
- Resources:
- Polyfill
- has.js test
- HTML5 Rocks tutorial