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 1,134,211 websites that are jQuery Once Customers. We know of 198,836 live websites using jQuery Once and an additional 935,375 sites that used jQuery Once historically and 71,838 websites in the United States.
Get a list of 1,134,211 websites using jQuery Once which includes location information, hosting data, contact details, 198,836 currently live websites and an additional 272,929 domains that redirect to sites in this list. 935,375 sites that used this technology previouslyand 71,838 websites in the United States currently using jQuery Once.
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