The docs do say that the element-tag attribute doesn't have to be a span so maybe other element-tags would be more meaningful for adding attributes beyond class/style? This makes me think that the term "tag" doesn't really refer to a "tiddlywiki tag" but a "HTML tag". Also, the enforced class/list attributes made me think of so called boolean attributes <https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#boolean-attributes> (ref list <https://gist.github.com/ArjanSchouten/0b8574a6ad7f5065a5e7>). Possibly useful.
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