@Phssthpok,
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doesn't approve of my margin settings and changes them
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When user agents (browsers; e-readers) deal with pts units, they seem to translate pts to absolute units--pixels. The results can be bizarre. A 150-px top margin for a 300dpi PaperWhite is 1\2 of an inch on the screen. For a 150dpi Samsung tablet, that translates to a full inch. Perhaps an unwanted difference.
Relative units like ems and %, in the long run, offer better solutions for screen devices.