The best way is usually to use CSS to make the separation. It is smart enough to not have a space line as the top line in a new page. Honoring a CR or CR/LF causing wrapping problems as well as spacing problems. In the interest of easy reading an indented first line in a paragraph (done with CSS) is a better option than a blank line to separate paragraphs. It places more text on a page so less page turns. A blank line is good for additional separation and the nbsp paragraph is fine for this. Readers should support both but CSS is always best if it suits. ePub 3 depends even more on CSS that 2 does.
Dale
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