Can I use
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KeyboardEvent.getModifierState()

- WD

KeyboardEvent method that returns the state (whether the key is pressed/locked or not) of the given modifier key.

Chrome

  1. ❌ 4 - 29: Not supported
  2. ✅ 30 - 143: Supported
  3. ✅ 144: Supported
  4. ✅ 145 - 147: Supported

Edge

  1. ✅ 12 - 143: Supported
  2. ✅ 144: Supported

Safari

  1. ❌ 3.1 - 10: Not supported
  2. ✅ 10.1 - 26.1: Supported
  3. ✅ 26.2: Supported
  4. ✅ 26.3 - TP: Supported

Firefox

  1. ❌ 2 - 14: Not supported
  2. ✅ 15 - 146: Supported
  3. ✅ 147: Supported
  4. ✅ 148 - 150: Supported

Opera

  1. ❌ 9 - 11.6: Not supported
  2. ﹖ 12: Support unknown
  3. ✅ 12.1: Supported
  4. ❌ 15 - 16: Not supported
  5. ✅ 17 - 124: Supported
  6. ✅ 125: Supported

IE

  1. ❌ 5.5 - 8: Not supported
  2. ✅ 9 - 10: Supported
  3. ✅ 11: Supported

Chrome for Android

  1. ✅ 144: Supported

Safari on iOS

  1. ❌ 3.2 - 10.2: Not supported
  2. ✅ 10.3 - 26.1: Supported
  3. ✅ 26.2: Supported
  4. ✅ 26.3: Supported

Samsung Internet

  1. ✅ 4 - 28: Supported
  2. ✅ 29: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 11.5: Not supported
  2. ﹖ 12: Support unknown
  3. ✅ 12.1: Supported
  4. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ❌ 2.1 - 4.3: Not supported
  2. ✅ 4.4 - 4.4.4: Supported
  3. ✅ 144: Supported

Firefox for Android

  1. ✅ 147: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ✅ 2.5: Supported
  2. ✅ 3: Supported
Resources:
WebKit feature request bug
MDN Web Docs - getModifierState