Google Hosted Libraries is a globally available content distribution network for the most popular, open-source JavaScript libraries.
https://developers.google.com/speed/libraries/
JavaScript Libraries and Functions
Get access to data on 38,572,286 websites that are Google Hosted Libraries Customers. We know of 10,119,233 live websites using Google Hosted Libraries and an additional 28,453,053 sites that used Google Hosted Libraries historically and 1,048,972 websites in the United States.
Get a list of 38,572,286 websites using Google Hosted Libraries which includes location information, hosting data, contact details, 10,119,233 currently live websites and an additional 2,081,557 domains that redirect to sites in this list. 28,453,053 sites that used this technology previouslyand 1,048,972 websites in the United States currently using Google Hosted Libraries.
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