Adding Namespace to Stylesheet
I've noticed that Calibre adds an "@namespace" line into the CSS when I convert any books to epub, I never add this line to any of the epub's I manually create though.
This doesn't seem to effect the epub when I read the book on any of my reading systems. So can someone tell me what this line is all about and if I should add it to my epubs or not because as far as I can see, It doesn't do anything.
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