Thread: Can't add cover in Calibre -- get "svg-error" (the property 'svg' should be declared)
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Old 04-11-2017, 05:58 PM   #3
jackie_w
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Would I be right in thinking this was an EPUB3 rather than an EPUB2? The cover page you added via calibre probably contained an image wrapped in an <svg> tag.

For EPUB3s, EpubCheck will show an error if the OPF manifest item for an XHTML file containing an <svg> tag doesn't have a properties="svg" attribute e.g.
Code:
<item href="text/titlepage.xhtml" id="titlepage" media-type="application/xhtml+xml" properties="svg"/>
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