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Topic: Chrome mobile / address bar (an address line) / Height

I something will not understand, what there chrome to itself considers?
I expose height of the root unit in

max-height:100vh

And as a result, the lowermost element quits for lower bound, forcing to do   to "remove" an address line.
Type, an address line he "for a page part" does not consider.
But why then at

overflow-y:hidden

the browser any more does not hide an address line?!
But also does not show page completely.
In an ideal - that at discovery the page was shown completely irrespective of the fact which  the browser still stuffs on the screen.