For what it may be worth, I would like to see ePub3 support being baked into KOReader. It's not as if the ePub3 specification is new since the first version (3.0) was finalized in Oct., 2011.
Thorium does a decent job of supporting ePub3 on my desktop and Kobo's proprietary renderer (the one used for kepub files on firmware 4 or less and used for kepub and non-drmed epubs on firmware 5.10+) does almost as decent job on my Kobo ereaders.
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