For what it's worth the WebKit based renderer used by Kobo for .kepub.epub is based on Readium. Back in the distant past, Kobo used the ACCESS NetFront™ BookReader EPUB Edition engine to render ePub3 files. After ACCESS contributed to Readium development by supplying its NetFront™ BookReader EPUB Edition engine to the Readium project, Kobo switched to using a customized Readium renderer.
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