KeyboardEvent.key, KeyboardEvent.which

Input:

Output:

Chromium reports wrong values after keyboard layout change

UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Steps to reproduce the problem:

1. Initial settings — two keyboard layouts switched by Caps Lock, swapped Ctrl and Alt:

   $ cat .xinitrc 
   setxkbmap dvorak,ru -option grp:caps_toggle
   xmodmap .Xmodmap
   $ cat .Xmodmap 
   clear control
   clear mod1
   keycode 37 = Alt_L Meta_L
   keycode 105 = Alt_R Meta_R
   keycode 64 = Control_L
   keycode 108 = Control_R
   add control = Control_L Control_R
   add mod1 = Alt_L Meta_L

2. Change settings to QWERTY:

   $ setxkbmap us
   

3. Try input above.

What is the expected behavior?

KeyboardEvent.key and KeyboardEvent.which should match my input.

What went wrong?

I type QWERTY but key and which shows Dvorak values. I press Ctrl, it displays Alt, but setxkbmap resets xmodmap.

Other browsers tested:

Firefox 83.0: OK

Bug tracking.