Converting books to epub in Calibre produces 2 CSS files, one of which (page_styles) doesn't pass CSS 3 validation:
How should page margins be defined in order to comply with CSS 3 specifications?
Quote:
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URI : TextArea 2 Value Error : margin-bottom Parse Error [empty string] 3 Value Error : margin-top Parse Error [empty string] Warnings (1) URI : TextArea 4 No declarations in the rule Valid CSS information @page { } |