W3C: at-rule namespace not implemented
At the end of editing a book with Sigil, I like to validate epubs with W3C also. There often appears the error: "Sorry, the at-rule @namespace is not
implemented."
On the top of my css appears: @namespace h "http://www.w3.org/1999/xhtml.
The books are readable, but I would like a correctly formed epub. Only that I have no idea what I'm doing wrong. Someone can tell me what I have to do, please?
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