Changes in HTML 5 - <script> Tag
What's new in HTML 5
The async="async" attribute has been added.
Differences between HTML 5 and earlier versions of HTML
The following attributes should not be coded on the <script> tag because they either have been deprecated or were never officially supported:
language
- use thetype
attribute instead
The 2000-2010 Recommendations from the W3C HTML Working Group defined the HTML namespace for the script element type name along with the names of all HTML element types. In older (pre-2000) versions of HTML, element type names were not associated with a namespace.