Changes in HTML 5 - <datalist> Tag

What's new in HTML 5

Differences between HTML 5 and earlier versions of HTML

The <datalist> tag did not exist in older versions of HTML.

The 2000-2010 Recommendations from the W3C HTML Working Group defined the HTML namespace for the names of all HTML element types, which now includes the element name. In older (pre-2000) versions of HTML, element type names were not associated with a namespace.