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
  2. 11

Edge

  1. 12 - 18
  2. 79 - 81
  3. 83

Firefox

  1. 2 - 5
  2. 6 - 77
  3. 78
  4. 79 - 80

Chrome

  1. 4 - 5
  2. 6 - 81
  3. 83
  4. 84 - 86

Safari

  1. 3.1 - 4
  2. 5 - 13
  3. 13.1
  4. 14 - TP

Opera

  1. 9 - 10.6
  2. 11 - 68
  3. 69

iOS Safari

  1. 3.2
  2. 4 - 13.3
  3. 13.4
  4. 14.0

Opera Mini

  1. all

Android Browser

  1. 2.1 - 4.3
  2. 4.4 - 4.4.4
  3. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 11
  2. 11.1 - 12.1
  3. 46

Chrome for Android

  1. 81

Firefox for Android

  1. 68

IE Mobile

  1. 10
  2. 11

UC Browser for Android

  1. 12.12

Samsung Internet

  1. 4 - 11.2
  2. 12.0

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

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