If I log out (Ctrl+D, or exit), the web terminal will show the following screen:

However, if I press "any key", nothing happens. I try A-Z, I try , ., [Enter] -> nothing happens. [Space] does seem to work.

Now, what's even more confusing is that it does work for keys I expect it not to. Modifiers like Command, Ctrl or Shift trigger it, which is wrong. Imagine I log out, then I type Cmd+W to close the web terminal, and it logs me back in just before the window closes.

Browser: Safari.