Quote:
Originally Posted by ralphiedee
can I post the book? Which format?
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Only if the book is not copyrighted, or you're the rights holder of the book.
I'm probably going to move this question to either the Sigil forum or the workshop forum, but in general: Sigil is not a "converter." It's an editor. Most of the html attributes you've mentioned are not allowed in xhtml. You need to manually edit your html to make it xhtml to get it to validate. I'd suggest an xhtml tutorial. Then you can use any editor you like to make the changes necessary.