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My standard when editing an ebook is to set the default margins to 0,0,0,0 which allows the reader to choose the margins.
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Setting it at 0.5em also allows the reader to choose the margins, so long as they don't want less, apparently. To me it's just adding a polite starting point. I can't understand anyone wanting less than 0.5em. It's just a slight margin to avoid any possibility of starting with zero margin.
On a web-page that is to be viewed on a smartphone 0.8em is pretty normal, sometimes more.