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The box style can be added to a paragraph style in LO Writer and works even without Aa Publisher mode on a Kindle Keyboard, PW3, Kobo, Sony etc. But not on a Kindle DXG.
The margins to box are whatever the paragraph margins are, and then the internal padding works. 1 pixel seems OK at 300 dpi.
I agree that maybe more than 1 px might be better for a single horizontal line at 300 dpi, but 2 pixels might be OK.
I test on a wide variety of eink readers as well as LCD stuff with a variety of Apps. Also preview in Calibre Viewer.
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