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 1,116,183 websites that are jQuery Once Customers. We know of 199,419 live websites using jQuery Once and an additional 916,764 sites that used jQuery Once historically and 72,358 websites in the United States.
Get a list of 1,116,183 websites using jQuery Once which includes location information, hosting data, contact details, 199,419 currently live websites and an additional 276,748 domains that redirect to sites in this list. 916,764 sites that used this technology previouslyand 72,358 websites in the United States currently using jQuery Once.
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