Currently, there's no way for an author to markup spelling errors in text. A [spelling] tag would address that deficiency.
This could be used for a number of reasons, from [sic]-style annotations, to conveying to the user that an area is misspelled using the same visual cues as contenteditable.
At this point, it'd simply be a semantic element. If there's any traction, we could certainly talk about additional attributes or another name, such as sic: [sic]misspeld[/sic]
Does the list need further use cases for its consideration? -Charles
