Tracking-script without the need for JQuery
Since version 2.3.0 jQuery dependency has been removed.
https://docs.usertrack.net/changelog.html#usertrack-230-1-july-2017
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I have actually thought about this for a while, the problem is that the visitors still have a wide range of browsers (ranging from IE8 to old Safari versions) and jQuery helps with making sure the resolution is correctly detected, the CORS AJAX requests are completed and much more stuff related to UI event detection.
I will not close this idea as this is something planned and will be eventually implemented, even with the risk of losing some correct recordings for users with very old browesrs.