CSS validation uses wrong validator?
The 'Validate Stylesheets With W3C' option under 'Tools' gave me repeated errors. But this was because it was validating against CSS 2.1 instead of CSS 3.
When I manually checked for myself by uploading the CSS file I got no errors, because it validated against CSS 3.
I'm not sure why when the CSS is uploaded by Sigil it is being checked against CSS 2.1 and not 3.
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