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: Not supported
  2. 9 - 10: Not supported (but has polyfill available)
  3. 11: Not supported (but has polyfill available)

Edge

  1. 12 - 13: Not supported (but has polyfill available)
  2. 14 - 18: Partial support
  3. 79: Supported
  4. 80: Supported

Firefox

  1. 2 - 3.6: Not supported
  2. 4 - 27: Partial support
  3. 28 - 71: Supported
  4. 72: Supported
  5. 73 - 74: Supported

Chrome

  1. 4 - 5: Not supported
  2. 6 - 24: Partial support
  3. 25 - 79: Supported
  4. 80: Supported
  5. 81 - 83: Supported

Safari

  1. 3.1: Not supported
  2. 3.2 - 12: Not supported (but has polyfill available)
  3. 12.1: Partial support
  4. 13: Partial support
  5. TP: Partial support

Opera

  1. 9 - 10.5: Not supported
  2. 10.6 - 15: Partial support
  3. 16 - 65: Supported
  4. 66: Supported

iOS Safari

  1. 3.2 - 12.1: Not supported
  2. 12.2 - 13.1: Partial support
  3. 13.2: Partial support
  4. 13.3: Partial support

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 2.2: Not supported
  2. 2.3 - 4.4.4: Partial support
  3. 76: Supported

Blackberry Browser

  1. 7: Not supported
  2. 10: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 46: Partial support

Chrome for Android

  1. 79: Supported

Firefox for Android

  1. 68: Supported

IE Mobile

  1. 10: Not supported (but has polyfill available)
  2. 11: Not supported (but has polyfill available)

UC Browser for Android

  1. 12.12: Supported

Samsung Internet

  1. 4: Partial support
  2. 5 - 9.2: Supported
  3. 10.1: Supported

QQ Browser

  1. 1.2: Supported

Baidu Browser

  1. 7.12: Supported

KaiOS Browser

  1. 2.5: Supported

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