XHTML+SMIL animation

- UNOFF

Method of using SMIL animation in web pages

Chrome

  1. 4 - 125: Not supported (but has polyfill available)
  2. 126: Not supported (but has polyfill available)
  3. 127 - 129: Not supported (but has polyfill available)

Edge

  1. 12 - 18: Not supported
  2. 79 - 125: Not supported (but has polyfill available)
  3. 126: Not supported (but has polyfill available)

Safari

  1. 3.1 - 17.4: Not supported (but has polyfill available)
  2. 17.5: Not supported (but has polyfill available)
  3. 17.6 - TP: Not supported (but has polyfill available)

Firefox

  1. 2 - 127: Not supported (but has polyfill available)
  2. 128: Not supported (but has polyfill available)
  3. 129 - 131: Not supported (but has polyfill available)

Opera

  1. 9 - 110: Not supported (but has polyfill available)
  2. 111: Not supported (but has polyfill available)

IE

  1. 5.5: Not supported
  2. 6 - 8: Partial support
  3. 9 - 10: Not supported
  4. 11: Not supported

Chrome for Android

  1. 126: Not supported (but has polyfill available)

Safari on iOS

  1. 3.2 - 17.4: Not supported (but has polyfill available)
  2. 17.5: Not supported (but has polyfill available)
  3. 17.6 - 18.0: Not supported (but has polyfill available)

Samsung Internet

  1. 4 - 24: Not supported (but has polyfill available)
  2. 25: Not supported (but has polyfill available)

Opera Mini

  1. all: Not supported (but has polyfill available)

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 80: Not supported (but has polyfill available)

UC Browser for Android

  1. 15.5: Not supported (but has polyfill available)

Android Browser

  1. 2.1 - 4.4.4: Not supported (but has polyfill available)
  2. 126: Not supported (but has polyfill available)

Firefox for Android

  1. 127: Not supported (but has polyfill available)

QQ Browser

  1. 14.9: Not supported (but has polyfill available)

Baidu Browser

  1. 13.52: Not supported (but has polyfill available)

KaiOS Browser

  1. 2.5: Not supported (but has polyfill available)
  2. 3: Not supported (but has polyfill available)

Internet Explorer supports the W3C proposal HTML+TIME, which is largely the same as XHTML+SMIL

Resources:
Wikipedia
JS library to support XHTML+SMIL