Why do jQuery samples often omit script type?

Why do jQuery samples often omit script type?

References

Reference NO 1

http://stackoverflow.com/questions/15204097/why-do-jquery-samples-often-omit-script-type

Reference NO 2

http://livescript.net/blog/powerful-jquery-with-livescript.html

Reference NO 3

http://webdesignledger.com/tips/9-jquery-mistakes-you-shouldnt-commit

Reference NO 4

http://www.sitepoint.com/jquery-vs-raw-javascript-1-dom-forms/

Reference NO 5

http://encosia.com/3-reasons-why-you-should-let-google-host-jquery-for-you/

Reference NO 6

http://cs.wellesley.edu/~cs110/lectures/Forms/

Reference NO 7

http://www.outsharked.com/imagemapster/default.aspx?docs.html

Reference NO 8

http://coding.smashingmagazine.com/2010/08/04/commonly-confused-bits-of-jquery/