>>> - How to trigger the hiding? - right mouse button menu or (more likely) something in the drop down? where would we put that? ... Mobiles notoriously don't

>>> - How to trigger the hiding? - right mouse button menu or (more likely) something in the drop down? where would we put that? ... Mobiles notoriously don't have mouse buttons, so any UI relying on right-click will not be usable there. It's odd that Google is considering mouse-based workarounds in all considered solutions, as if unaware of that. or maybe Chromium is only the desktop browser?