WebM video format

- OTHER

Multimedia format designed to provide a royalty-free, high-quality open video compression format for use with HTML5 video. WebM supports the video codec VP8 and VP9.

IE

  1. 5.5 - 8
  2. 9 - 10
  3. 11

Edge

  1. 12 - 13
  2. 14 - 18
  3. 79 - 81
  4. 83

Firefox

  1. 2 - 3.6
  2. 4 - 27
  3. 28 - 77
  4. 78
  5. 79 - 80

Chrome

  1. 4 - 5
  2. 6 - 24
  3. 25 - 81
  4. 83
  5. 84 - 86

Safari

  1. 3.1
  2. 3.2 - 12
  3. 12.1 - 13
  4. 13.1
  5. 14 - TP

Opera

  1. 9 - 10.5
  2. 10.6 - 15
  3. 16 - 68
  4. 69

iOS Safari

  1. 3.2 - 12.1
  2. 12.2 - 13.3
  3. 13.4
  4. 14.0

Opera Mini

  1. all

Android Browser

  1. 2.1 - 2.2
  2. 2.3 - 4.4.4
  3. 81

Blackberry Browser

  1. 7
  2. 10

Opera Mobile

  1. 10 - 12.1
  2. 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
  2. 5 - 11.2
  3. 12.0

QQ Browser

  1. 10.4

Baidu Browser

  1. 7.12

KaiOS Browser

  1. 2.5

Will work in IE9+ and Safari/MacOSX provided the user has the WebM codecs installed. Partial support indicates that at least one codec is supported but not all. MS Edge supports VP9 from MSE sources, also progressive sources are not supported by Edge.

Resources:
has.js test
Codec for IE9 support
Info on supporting WebM in Safari
Perian :Mac OSX Webm Codec install
Official website