http://www.w3.org/ns/prov#value | - most e reader devices replace all fonts with their own built-in fonts anyway - certainly both Kindle & Sony readers do - so focus mainly on font sizes, there is in HTML / EPUB an option to use "simple font sizes of small , large etc rather than precise measurements. also text in header tags will default to being larger than text in paragraphs without you specifying it in detail.
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