There is no raw html. This is an ebook editor, in other words you give it an ebook already in epub or azw3. And adding an import tool to process html files into epub with no changes is trivial calibre already does that, try adding an html file to calibre you will get a zip, with all linked files, images, styles and an autogenerated opf with no changes made anywhere (except for link rewriting). Just rename that zip to .epub and add in the boilerplate META-INF/content.xml and mimetype files and there you go -- an epub from html.
@JSWolf: In fact the above approach can be generalized to *all* ebook formats calibre can handle, including LIT.
Last edited by kovidgoyal; 10-09-2013 at 09:19 AM.
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