I think this feature is on the roadmap. You can help the team prioritize this feature by voting for it here
Also look up other similar requests and vote for them.
Hi. I'm not sure if you are talking about the same aspect. I was wondering if Xd is supposed to generate markup in the future instead of just one large png reference as explained - not if a copy CSS routine is going to be implemented.
Right now, we're focused on being a UX/UI prototyping tool, not something that exports live HTML. However, it's still a potential future for us, so we're not excluding it. We're looking at potentially copying CSS elements from the design in our developer handoff feature, so you might want to upvote that in UserVoice as well.