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JavaScript code does not perform

Source: Internet
Author: User
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One day there were two colleagues asked me why his JS code there is a puzzling problem

<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01//en" "HTTP://WWW.W3.ORG/TR/HTML4/STRICT.DTD" >
Neither of the above code will be executed because both script and IFRAME tags are not self-closing. 
There is <script type= ' JavaScript ' > type if it is wrong, JS will not execute.

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