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I have three responsive ads within a page. Every ad unit loads adsbygoogle .jsbefore rendering.

<script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>

According to google, I understand I can load adsbygoogle.js once instead of three times. Ref: google's help document

My question is, can I place a single script tag before head close </head>? Or should I include only within the body <body> tags?

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Micheal Kleber(Google Engineer)

Yes, it is fine to load adsbygoogle.js only once. That's certainly how I would do it for a web page I was designing: load it just once from <head>. It's only included directly in the AdSense snippet to make it as easy as possible for people to copy-and-paste the HTML. Goran is right that loading it multiple times probably has no perceptible effect on anything, but the duplicate loads are certainly unnecessary and are fine to drop.

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