ive seen a few posts asking for full CSS and imo the best way to handle more advanced crimes (including JS crimes) would be to add another post type: embed posts. you basically get a normal post, can post HTML but it runs in an iframe from an origin for a user (like, idk, lexi.cohost-posts.org for example) and that replaces the post body, and you get a little annotation that it's embedded. the current meta with iframely just isn't that great, a lot of stuff still sucks but a clarified embed post type would solve this i think
this would be a good compromise between not making normal css crimes special and the current hacky iframe method with cutting off the bottom and using tumblr behind the scenes, and would make it more transparent. it would also make CSS more accessible to new people, the inline method is a bit hacky, and this could allow full CSS. just a suggestion tho :3