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kovidgoyal · 10-14-2014, 09:34 AM

vh is not a valid unit in CSS 2.1. WHat to do with it depends on the target device(s) you are amking the book for. If you can check it works, ignore the message, if you check and find it doesn't work, delete/replace it.

10-14-2014, 09:34 AM	#2
kovidgoyal creator of calibre Posts: 45,415 Karma: 27757236 Join Date: Oct 2006 Location: Mumbai, India Device: Various	vh is not a valid unit in CSS 2.1. WHat to do with it depends on the target device(s) you are amking the book for. If you can check it works, ignore the message, if you check and find it doesn't work, delete/replace it.