Server-sent events

- LS

Method of continuously sending data from a server to the browser, rather than repeatedly requesting it (EventSource interface, used to fall under HTML5)

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 91: Supported
  3. 92: Supported

Firefox

  1. 2 - 5: Not supported
  2. 6 - 89: Supported
  3. 90: Supported
  4. 91 - 92: Supported

Chrome

  1. 4 - 5: Not supported
  2. 6 - 91: Supported
  3. 92: Supported
  4. 93 - 95: Supported

Safari

  1. 3.1 - 4: Not supported
  2. 5 - 14: Supported
  3. 14.1: Supported
  4. 15 - TP: Supported

Opera

  1. 9 - 10.6: Partial support
  2. 11 - 76: Supported
  3. 77: Supported

Safari on iOS

  1. 3.2: Not supported
  2. 4 - 14.4: Supported
  3. 14.5: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.3: Not supported
  2. 4.4 - 4.4.4: Supported
  3. 92: Supported

Opera Mobile

  1. 10 - 11: Partial support
  2. 11.1 - 12.1: Supported
  3. 64: Supported

Chrome for Android

  1. 92: Supported

Firefox for Android

  1. 90: Supported

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4 - 13.0: Supported
  2. 14.0: Supported

QQ Browser

  1. 10.4: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported
Resources:
Blog post with demo
Polyfill
has.js test
HTML5 Rocks tutorial