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 1,139,092 websites that are jQuery Once Customers. We know of 194,043 live websites using jQuery Once and an additional 945,049 sites that used jQuery Once historically and 69,796 websites in the United States.
Get a list of 1,139,092 websites using jQuery Once which includes location information, hosting data, contact details, 194,043 currently live websites and an additional 268,427 domains that redirect to sites in this list. 945,049 sites that used this technology previouslyand 69,796 websites in the United States currently using jQuery Once.
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