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-rw-r--r--src/Text/Pandoc/Writers/HTML.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index f07d0381f..25f3163c2 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -580,6 +580,7 @@ toAttrs kvs = do
return $ map (\(x,y) ->
customAttribute
(fromString (if not html5 || x `Set.member` html5Attributes
+ || "epub:" `isPrefixOf` x
|| "data-" `isPrefixOf` x
then x
else "data-" ++ x)) (toValue y)) kvs