Why would you want to import the HTML manually into Sigil instead of using the 'export ePUB' function of the add-in? You can set it so that it will open the ePUB in Sigil after creation.
Anyway, the content attribute is not required for HTML. That being said, nor for ePUB. In an ePUB the metadata is stored in the OPF file, not the HTML. I am not quite sure how Sigil handles HTML import (it has been a while since I used it), remember that XHTML is not the same as HTML. There are differences, this being one of them. If your target of the conversion is an ePUB, I would strongly recommend the 'export ePUB' option. You can do just a basic ePUB creation to more complex with splitting the file and more.
Last edited by Toxaris; 11-12-2016 at 03:00 AM.
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