LazyLoad is a tiny (only 998 bytes minified and gzipped), dependency-free JavaScript library that makes it super easy to load external JavaScript and CSS files on demand.
https://github.com/rgrove/lazyload/
JavaScript Libraries and Functions
Get access to data on 2,872,085 websites that are Lazy Load Customers. We know of 762,351 live websites using Lazy Load and an additional 2,109,734 sites that used Lazy Load historically and 353,942 websites in the United States.
Get a list of 2,872,085 websites using Lazy Load which includes location information, hosting data, contact details, 762,351 currently live websites and an additional 351,177 domains that redirect to sites in this list. 2,109,734 sites that used this technology previouslyand 353,942 websites in the United States currently using Lazy Load.
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