Filters out all elements that had the same filter applied on them before.
https://plugins.jquery.com/once/
JavaScript Libraries and Functions · jQuery Plugin
Get access to data on 1,143,772 websites that are jQuery Once Customers. We know of 197,962 live websites using jQuery Once and an additional 945,810 sites that used jQuery Once historically and 70,795 websites in the United States.
Get a list of 1,143,772 websites using jQuery Once which includes location information, hosting data, contact details, 197,962 currently live websites and an additional 283,254 domains that redirect to sites in this list. 945,810 sites that used this technology previouslyand 70,795 websites in the United States currently using jQuery Once.
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