Why would you do that rather than just bind the editable property to something though? I don't actually see CSS the language as anything to be especially proud

Why would you do that rather than just bind the editable property to something though? I don't actually see CSS the language as anything to be especially proud of, although the borders/box/cascade design can be useful. Great that the DOM API got this basic thing at some point. Now how do you define observable properties on non-DOM objects? The whole thing is just a pile of special case hacks really.