The HTML5.1 script tag constantly refers to the "text/javascript" MIME type which has been obsolete since 2006 according to RFC4329.  We should stop using the obsolete MIME type and move on to one of the non-obsoleted MIME types, be this "application/ecmascript" or "application/javascript".

Excerpt from the Spec:

"The type attribute gives the language of the script or format of the data. If the attribute is present, its value must be a valid MIME type. The charset parameter must not be specified. The default, which is used if the attribute is absent, is "text/javascript"."


As per RFC4329 Section 3

Use of the "text" top-level type for this kind of content is known to
   be problematic.  This document thus defines text/javascript and text/
   ecmascript but marks them as "obsolete".  Use of experimental and
   unregistered media types, as listed in part above, is discouraged.
   The media types,

      * application/javascript
      * application/ecmascript

   which are also defined in this document, are intended for common use
   and should be used instead.