Sorry to be doubting, but are you sure?

I got curious, and looked at the DOM, and seems the editor when empty is just one line of the full page, which if you click anywhere else (like what I did initially, in the middle of the page) the editor can't be focused. Are you sure you clicked in the middle of the page?

Looks like this for me: https://i.imgur.com/DOdiN4o.png

Unless you click that specific rectangle, the editor doesn't focus, isn't it the same in Safari?