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 1,085,660 websites that are Enquire JS Customers. We know of 244,520 live websites using Enquire JS and an additional 841,140 sites that used Enquire JS historically and 161,807 websites in the United States.
Get a list of 1,085,660 websites using Enquire JS which includes location information, hosting data, contact details, 244,520 currently live websites and an additional 196,279 domains that redirect to sites in this list. 841,140 sites that used this technology previously and 161,807 websites in the United States currently using Enquire JS.