TextMetrics API: emHeightAscent

IE

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

Edge

  1. 12 - 18: Not supported
  2. 79 - 108: Disabled by default
  3. 109: Disabled by default

Firefox

  1. 2 - 73: Not supported
  2. 74 - 108: Disabled by default
  3. 109: Disabled by default
  4. 110 - 111: Disabled by default

Chrome

  1. 4 - 34: Not supported
  2. 35 - 108: Disabled by default
  3. 109: Disabled by default
  4. 110 - 112: Disabled by default

Safari

  1. 3.1 - 11: Not supported
  2. 11.1 - 16.2: Supported
  3. 16.3: Supported
  4. TP: Supported

Opera

  1. 10 - 21: Not supported
  2. 22 - 91: Disabled by default
  3. 92: Disabled by default

Safari on iOS

  1. 3.2 - 11.2: Not supported
  2. 11.3 - 16.2: Supported
  3. 16.3: Supported

Opera Mini

  1. all: Support unknown

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 109: Not supported

Opera Mobile

  1. 12 - 12.1: Not supported
  2. 72: Not supported

Chrome for Android

  1. 109: Disabled by default

Firefox for Android

  1. 107: Not supported

UC Browser for Android

  1. 13.4: Support unknown

Samsung Internet

  1. 4 - 18.0: Not supported
  2. 19.0: Not supported

QQ Browser

  1. 13.1: Support unknown

Baidu Browser

  1. 13.18: Support unknown

KaiOS Browser

  1. 2.5: Support unknown