newbie jquery question "class" in script tag

Hi I saw this line in a tutorial on javascript

<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.0/jquery.min.js"></script>

I am pretty new and have never seen  a class assigned in a script tag before 

Could someone could kindly explain me the possible purposes of this technique and how it works?

Many thanks

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