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One thing to be aware of is that Sigil and the Calibre editor DO NOT show it as it will be displayed necessarily. They are more tolerant of errors and will accept web page types of styles which are not acceptable in epubs.
If you are making epubs to be shown on a variety of devices, you need to make sure you stick to the subset of styles that are allowed by epubs, not the broader ones which make up web pages.
Having them validated is dead simple in Sigil, Validate Stylesheets with W3C, so it is the thing to do.
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