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 1,131,085 websites that are jQuery Once Customers. We know of 196,510 live websites using jQuery Once and an additional 934,575 sites that used jQuery Once historically and 70,715 websites in the United States.
Get a list of 1,131,085 websites using jQuery Once which includes location information, hosting data, contact details, 196,510 currently live websites and an additional 267,302 domains that redirect to sites in this list. 934,575 sites that used this technology previouslyand 70,715 websites in the United States currently using jQuery Once.
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