Only about 3% of Browser have JS disabled and legacy ga.js does not run if JS is disable and Firefox V23 prevents JS being turned off, also if a user has reached a sale page they probably have JS enabled – thus this this step is very much optional:

<!– Google Tag Manager NOSCRIPT tag example –>

<noscript>

<iframe src=”//www.googletagmanager.com/ns.html?transactionId=123&amp;transactionTotal=100.00″ height=”0″ width=”0″ style=”display:none;visibility:hidden”>

</iframe>

</noscript>

 

A similar method can be used to track robots visits which don`t execute JS using a customImage and UA-00000-5 account. See this post here:

www.google-analytics.com/collect?v=1&tid={{ga_settings_id_robotTracker}}&cid={{autoRandomNumber}}&t=pageview&dp=/robot

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