I previously asked a UI scaling HTML5 related question, I now realize this have nothing to do with exported platforms but is an Armory question that have nothing to do with the HTML 5 output.
I think that there is currently no defined way to handle this at the moment. I definitely needs to be there, but I don’t think it is yet. I think ZUI has options to set the UI element anchor, which might let you keep the buttons on the screen, but I don’t there there is any way to keep the 3D view from scaling to fit yet.
Basic overall scaling should have been sorted out right at the beginning.
However I am hopeful.
Will continue to learn until it is production ready.
There is a lot of work to be done, but I really believe Armory will turn into something amazing. 
If there isn’t one already, you should open an issue on GitHub for scaling to add it to Lubos’s task list. He’ll get to it when he can.
I don’t do GitHub.
Maybe you can do it if you also feel this is important.
Just send him a link to this image I have posted.
A picture is worth a thousand words.
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There you go.
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