Cita:
Iniciado por caricatos 
NueveReinas: Olvídate de dar esos consejos... son absurdos.
Citando a "HTML Standard":
Cita: If the language is not that described by "text/javascript", then the type attribute must be present, as described below. [...]
[...] 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".
https://html.spec.whatwg.org/multipa...ng.html#script
Solo es un consejo, totalmente opcional. Pero a tener en cuenta.
