With HTML up to and including HTML 4.01 and XHTML, there were four valid attributes: , , and .

Under HTML 5 there are now five valid attributes, having been added.

A major debate over sexual orientation is over whether or not non-heterosexuality is a valid physical attribute, with religious and social conservatives often perceiving sexual orientation as a "correctable" behavior.

If a single valid attribute for statehood was evident in "Somaliland's" otherwise fake dossier for a separate statehood, it would have been recognized by the international community decades ago in the same way as Kosovo, East Timor, Eretria and South Sudan were recognized.