[KevinH]

Again, and for the last time. This is not a topic for the Sigil forum.

Second, I already explained the best way to move forward. And yes, under epub3 almost all of html5 standard is allowed but with xhtml syntax.

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.

I am closing this issue to further discussion.

Originally Posted by apoiata

Indeed the better place to discuss supported tags by various ebook e-readers is really a subject for the various reader forums but initial question wasn't about it. The initial question was about which tags to use when I want to create epub file.

There is a suggestion to check different readers and their supported tags but in reality you will not see epub books for different readers. Publishers allow to download only one epub file, mobi and pdf file. I didn't see on the market epub files for iPad, Android tablet, iPhone, etc.

So we return to my initial question: Which tags I have to use for creating epub files which will be recognized by most readers/applications?

Pointing to xhtml, html5, html4, etc standards is useless because not all tags have a meaning in epub file. I believe it has to be a list of tags which most of readers/application will recognize and make appropriate actions on content.