It basically says when you're done with the book, you should:
- search for entities and delete them, if they were accidentally added
- delete redundant html tags such as <p> </p> and <div></div>
- delete redundant empty attributes such as src="", href="" and all other empty ="" attributes
- replace characters such as an en dash (–) in epub2 books with the corresponding – HTML entity so that you can easily tell it apart from a hyphen*
- replace straight quotes (' ") with curly quotes (‘ “ ” ’)**
*You can't use
named entities in epub
3 books (you'll need to use
– or
–); entities to be preserved, need be added via Preferences > Preserve Entities
**Users can automatically replace them with DiapDealer's
PunctuationSmarten Sigil plugin