enquire.js is a lightweight, pure JavaScript library for responding to CSS media queries.
http://wicky.nillia.ms/enquire.js/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 909,940 websites that are Enquire JS Customers. We know of 194,503 live websites using Enquire JS and an additional 715,437 sites that used Enquire JS historically and 124,364 websites in the United States.
Get a list of 909,940 websites using Enquire JS which includes location information, hosting data, contact details, 418,901 currently live websites which includes 224,398 domains that redirect to sites in the list. 715,437 sites that used this technology previously and 124,364 websites in the United States currently using Enquire JS.