The keyboard input in egui is limited in a couple of ways:

• Lots of keys missing from Event::Key
• We don't report the super/meta modifier key
• We don't report modifier key presses (just their state)
• Physical keys not reported on the eframe web backend
• KeyboardShortcut should ignore shift and alt keys for logical keys (e.g. Ctrl Plus may require pressing shift on some keyboards). See The keyboard shortcut of zoom in does not work on the JIS keyboard #3626 for more

How can I help?

• Look at the code for egui::Key and follow the instructions there for adding new keys
• Investigate if we can get physical keycode on web

Requested keys

• Numpad
• Volume keys
• Curly brackets: { and }
• CapsLock (Caps Lock Key/Modifier #2041)
• Modifier keys

Prioir art

• winit: https://docs.rs/winit/latest/winit/event/struct.KeyEvent.html
• https://github.com/pyfisch/keyboard-types

Relevant issues

• Need to Distinguish Left and Right Keys for "Ctrl, Alt, Shift" on the Keyboard #3636
• The keyboard shortcut of zoom in does not work on the JIS keyboard #3626
• Issue with number key mapping #3415
• Need more key mappings #3372
• Add non-portable keys to egui::Key #3303
• Omitted keys prevent implementation of macOS standard shortcuts  #3099
• Add more pressen keys to ctx.input #3094
• Forward scancodes via egui-winit #2977
• Caps Lock Key/Modifier #2041
• Universal clipboard shortcuts (Ctrl+C/V/X) don't work with non-Latin keyboard layouts #4081

Physical vs Logical keys

• Partially fixed by Update to winit 0.29 #3649 (needs web support, if even possible?)

Consider someone owning a physical QWERTY keyboard:

However, they have remapped it to use Dvorak (perhaps even repainting the text on their keyboard):

If they start hitting Caps Lock and then moving to the left, the keys they will be hitting will be

• physical (qwerty): CapsLock, A, S, D, F, …
• logical (Dvorak): CapsLock, A, O, E, U …

The logical keys makes sense for most keyboard shortcuts - if you say "Press Cmd+S to save" in your UI, the user will be looking for the logical key "S"
The physical keys are mostly useful for games, where e.g. te physical WSAD on QWERTY moves a character, no matter what the users keymap is.