MathML

- REC

Special tags that allow mathematical formulas and notations to be written on web pages.

IE

  1. 5.5: Not supported
  2. 6 - 8: Not supported (but has polyfill available)
  3. 9 - 10: Not supported
  4. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 85: Not supported (but has polyfill available)
  3. 86: Not supported (but has polyfill available)

Firefox

  1. 2 - 3.6: Supported
  2. 4 - 80: Supported
  3. 81: Supported
  4. 82 - 83: Supported

Chrome

  1. 4 - 23: Not supported (but has polyfill available)
  2. 24: Supported
  3. 25 - 85: Not supported (but has polyfill available)
  4. 86: Not supported (but has polyfill available)
  5. 87 - 89: Not supported (but has polyfill available)

Safari

  1. 3.1 - 9.1: Partial support
  2. 10 - 13.1: Supported
  3. 14: Supported
  4. TP: Supported

Opera

  1. 9: Not supported
  2. 9.5 - 12.1: Partial support
  3. 15 - 70: Not supported (but has polyfill available)
  4. 71: Not supported (but has polyfill available)

iOS Safari

  1. 3.2 - 4.3: Not supported (but has polyfill available)
  2. 5 - 13.7: Supported
  3. 14: Supported

Opera Mini

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

Android Browser

  1. 2.1 - 4.4.4: Not supported (but has polyfill available)
  2. 81: Not supported (but has polyfill available)

Blackberry Browser

  1. 7: Not supported (but has polyfill available)
  2. 10: Supported

Opera Mobile

  1. 10 - 12.1: Not supported (but has polyfill available)
  2. 59: Not supported (but has polyfill available)

Chrome for Android

  1. 85: Not supported (but has polyfill available)

Firefox for Android

  1. 79: Supported

IE Mobile

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

UC Browser for Android

  1. 12.12: Partial support

Samsung Internet

  1. 4 - 11.2: Not supported (but has polyfill available)
  2. 12.0: Not supported (but has polyfill available)

QQ Browser

  1. 10.4: Not supported (but has polyfill available)

Baidu Browser

  1. 7.12: Not supported (but has polyfill available)

KaiOS Browser

  1. 2.5: Supported

Opera's support is limited to a CSS profile of MathML. Support was added in Chrome 24, but removed afterwards due to instability.

Resources:
MathML torture test
MDN Web Docs - MathML Element
Wikipedia
Cross-browser support script
MathML demos