I think mediawiki (the software that runs both wikipedia and this question wiki) only allows text by default. But there’s no reason why the pages can’t just link to relevant sources. And in fact probably some questions should be answered with just one link to the relevant wikipedia page.
Ideally pages should synthesize relevant sources but I think just listing sources is better than nothing.
MediaWiki supports plugins, so in theory you could write your own plugin with any functionality you need… in practice, this could turn out to be a lot of work.
I’m not sure I’m getting your question.
I think mediawiki (the software that runs both wikipedia and this question wiki) only allows text by default. But there’s no reason why the pages can’t just link to relevant sources. And in fact probably some questions should be answered with just one link to the relevant wikipedia page.
Ideally pages should synthesize relevant sources but I think just listing sources is better than nothing.
MediaWiki supports plugins, so in theory you could write your own plugin with any functionality you need… in practice, this could turn out to be a lot of work.