So here I am looking for the same solution as the people above me. I use Chrome in Modern UI mode cause it's what I was looking for: fullscreen experience with address/bookmark bar at one quick mouse swipe. Yet there's that forementioned black title bar appearing. Would be great to see it disappear.
And to the MVP person that responded "Microsoft never thought of it" - ok, the question is, is it important how people feel and use the item in practice? There's quite a demand for this feature and this is how you develop stuff in the modern way: you stick to the end user, understand his needs and do it so that he gets the best experience possible. I understand if you can't implement it due to technical or time constraints, yet negating the feedback/request by saying "Microsoft never thought of it" (which equals to me to "this is how you're supposed to use it, stop complaining") is pure ignorance.
**There's a semi solution for keyboard users: whenever you see the title bar, press shift.**So there's also a possible way to get around the problem: identify the trigger that makes the title bar appear then simulate pressing shift.
Best regards
Szymon