thanks for the link & the explanation - it's not clear what they consider to be a low resolution screen though as they give no screen size examples.
thus I am none the wiser as to what 0.5px actually translates to
a) on my Kindle screen
b) on my 1920x1200 pc screen.
Another reason to avoid px & stick with em measurements, I think!
though I have to admit that the book with the 4.5px borders looks good on both screens!
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