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Explain this JavaScript code

 
Greenhorn
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This is javascript bookmarklet to download youtube videos.
Can anyone explain me this in brief ?

I have little knowledge of javascript.

Thank you!
 
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It's using Ajax to make a request and then creating elements to inject into the DOM using the returned results.

If you are new to JavaScript, you need to learn about Ajax and DOM manipulation to understand the snippet.

These subjects are far too broad to teach in a forum post; you will find many tutorials and books available that covers these subjects.
 
Consider Paul's rocket mass heater.
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