using pandoc to generate reveal.js slides with --self-contained data-attributes do not get converted.
Slide backgrounds can for example be set by data-background or data-background-image. (https://github.com/hakimel/reveal.js/#slide-backgrounds) These data-attributes do not get base64-converted.
# title {data-background-image="img/bg.jpg"}
ist this intended? Base64 conversion of these data-attributed images would be good.