> But we are long overdue for versioning The trend seemed to be in the opposite direction. In the early days, you could use the language attribute of the scri

> But we are long overdue for versioning The trend seemed to be in the opposite direction. In the early days, you could use the language attribute of the script tag to specify a version, e.g. language="JavaScript1.2". But that failed to become a standard. HTML used to be versioned by the DOCTYPE, but that fell out of favor with HTML5.