Quote:
Originally Posted by Doitsu
This is definitely an epubcheck 3.01. bug. Apparently it doesn't like rgb color-stop values. Try replacing them with a hex value. The following appears to work:
Code:
background-image: -webkit-gradient(radial,50% 50%, 0, 50% 50%, 26,from(white),color-stop(0.4, #F8FF80),to(transparent));
At least it causes no validation errors. 
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Except that loses the 50% opacity of the color stop, unless I'm missing something.
Better to email Kobo and ask them to update their buggy validator. :-)
You might also try adding a space between the close parentheses in case it's a really silly parser bug.