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This is really not a subject for the Sigil forum. Which subsets of xhtml, html5, html4, etc are supported by various ebook e-readers is really a subject for the various reader forums.
Please note, the quickest way to get up to speed on epubs is to download both epub2 and epub3 official epubs from the idpf and w3c sites and even from here in Mobileread's public domain collection and study the code yourself.
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