It's impossible to focus on these windows with keyboard shortcuts

I've been working without a mouse for several days and almost everything has been fairly easy to manage with keyboard shortcuts.

There are two exceptions:

I'm unable to find a keyboard shortcut that moves the focus to either of these windows.

(EDIT I am on macOS Mojava)

I've tried:

• Cmd-Tab
• Control-Tab from Finder
• Shortcat
• ^F6 (floating window)

How can I focus (close/dismiss) these windows using only the keyboard?

I could, obviously, use some keyboard control of the mouse, but that's generally a very long and slow process, and it really feels like there should be a better way...

I don't know any shortcut, but there is a workaround how you can use keyboard only to focus it. You may enable mouse keys - press 5 times Alt key and then use keyboard to move the cursor.

Alternatively you may install some third party tool to control the mouse. My recommendation goes to Karabiner Elements, because I use it for bunch of other useful staff. Once you install it you should add Mouse Keys Mode.

There is also https://github.com/h2ero/XEasyMotion but I haven't used it personally.