TextMetrics API: emHeightDescent

IE

  1. 6 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 148: Disabled by default
  3. 149: Disabled by default

Firefox

  1. 2 - 117: Not supported
  2. 118 - 150: Supported
  3. 151: Supported
  4. 152 - 154: Supported

Chrome

  1. 4 - 76: Not supported
  2. 77 - 148: Disabled by default
  3. 149: Disabled by default
  4. 150 - 152: Disabled by default

Safari

  1. 3.1 - 11: Not supported
  2. 11.1 - 26.3: Supported
  3. 26.4: Supported
  4. 26.5 - TP: Supported

Opera

  1. 10 - 63: Not supported
  2. 64 - 127: Disabled by default
  3. 131: Disabled by default

Safari on iOS

  1. 3.2 - 11.2: Not supported
  2. 11.3 - 26.3: Supported
  3. 26.4: Supported
  4. 26.5: Supported

Opera Mini

  1. all: Support unknown

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 149: Not supported

Opera Mobile

  1. 12 - 12.1: Not supported
  2. 80: Not supported

Chrome for Android

  1. 149: Disabled by default

Firefox for Android

  1. 151: Supported

UC Browser for Android

  1. 15.5: Disabled by default

Samsung Internet

  1. 4 - 29: Not supported
  2. 30: Not supported

QQ Browser

  1. 14.9: Disabled by default

Baidu Browser

  1. 13.52: Support unknown

KaiOS Browser

  1. 2.5: Not supported
  2. 3: Disabled by default