Can I use
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KeyboardEvent.code

- WD

A KeyboardEvent property representing the physical key that was pressed, ignoring the keyboard layout and ignoring whether any modifier keys were active.

IE

  1. 5.5 - 10: Not supported
  2. 11: Not supported

Edge

  1. 12 - 18: Not supported
  2. 79 - 91: Supported
  3. 92: Supported

Firefox

  1. 2 - 37: Not supported
  2. 38 - 89: Supported
  3. 90: Supported
  4. 91 - 92: Supported

Chrome

  1. 4 - 41: Not supported
  2. 42 - 47: Disabled by default
  3. 48 - 91: Supported
  4. 92: Supported
  5. 93 - 95: Supported

Safari

  1. 3.1 - 10: Not supported
  2. 10.1 - 14: Supported
  3. 14.1: Supported
  4. 15 - TP: Supported

Opera

  1. 9 - 28: Not supported
  2. 29 - 34: Disabled by default
  3. 35 - 76: Supported
  4. 77: Supported

Safari on iOS

  1. 3.2 - 10.2: Not supported
  2. 10.3 - 14.4: Supported
  3. 14.5: Supported

Opera Mini

  1. all: Not supported

Android Browser

  1. 2.1 - 4.4.4: Not supported
  2. 92: Not supported

Opera Mobile

  1. 10 - 12.1: Not supported
  2. 64: Not supported

Chrome for Android

  1. 92: Disabled by default

Firefox for Android

  1. 90: Supported

UC Browser for Android

  1. 12.12: Not supported

Samsung Internet

  1. 4: Not supported
  2. 5 - 13.0: Disabled by default
  3. 14.0: Disabled by default

QQ Browser

  1. 10.4: Not supported

Baidu Browser

  1. 7.12: Disabled by default

KaiOS Browser

  1. 2.5: Supported

"Some key events, or their values, might be suppressed by the IME in use". On mobile (virtual keyboard), all keys are reported as empty ("").

Resources:
WebKit feature request bug
Chrome tracking bug
MDN Web Docs - code