Let for formally solicit proposals: folks, give me a clean, unobtrusive, user interface for (1) specifying spans and divs in wikitext with class and/or id; (2) attaching a stylesheet to a page, and being able to edit it.
same as the [[image:--- namespace and the proposed [[math:-- generated images, and the [[fr:-- links at the top of a page: use
[[style:chemistry]] at the top of a page