I don't understand. Currently the website I'm on and the browser get access to all my keystrokes. The suggestion is to allow an <input> tab to let the browser t

I don't understand. Currently the website I'm on and the browser get access to all my keystrokes. The suggestion is to allow an <input> tab to let the browser take over and do its thing for suggesting autocompletes (whatever that is) instead of the website suggesting them. What's the novel security concern?