Javascript is an easy-to-use programming language that can be embedded 
in the header of your web pages.  It can enhance the dynamics and 
interactive features
of your page by allowing you to perform calculations, check forms, write
 interactive games, add special effects, customize graphics selections, 
create security
passwords and more.
https://now.ntu.ac.uk/d2l/lms/content/viewer/main_frame.d2l?ou=124282&tId=563994
 
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