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 1,164,997 websites jQuery Once Customers. We know of 237,948 live websites using jQuery Once and an additional 927,049 sites that used jQuery Once historically and 78,788 websites in the United States.
Get a list of 1,164,997 websites using jQuery Once which includes location information, hosting data, contact details, 237,948 currently live websites and an additional 318,314 domains that redirect to sites in this list. 927,049 sites that used this technology previouslyand 78,788 websites in the United States currently using jQuery Once.
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