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					Originally Posted by tosca30  The HTML files I import in Sigil are automatically 'compiled' from Scrivener using a MultiMarkDown to HTML procedure. But Sigil doesn't seem to consider valid <figure> and <figcaption> tags.Am I missing something? Do I need to replace all these tags by <div>s?
 
 Thanks for helping.
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tosca30 - those are HTML5 tags, so they may be available EPUB3.  As I understand it Sigil is actively being enhanced to be EPUB3 compliant.  
To that end there's this plugin that you might want to consider ==>> 
epub3 output plugin for Sigil.  Its author Kevin H did initially label as 'experimental', the intent is to eventually fold it into the Sigil core product.  
You're ahead of the curve 
 
BR