@BasilBourque, I feel this can be presented by that mainly the answer's 1st sentence is extremely brief / deceptive: " is enough but in XHTML is most well-liked ..." => a single could infer Which may be used in XHTML, which is not fact. @Knickerless-Noggins I am not sure in which you're looking at that, but is beautifully suitable, and W3Schools