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 934,620 websites that are Enquire JS Customers. We know of 205,728 live websites using Enquire JS and an additional 728,892 sites that used Enquire JS historically and 128,477 websites in the United States.
Get a list of 934,620 websites using Enquire JS which includes location information, hosting data, contact details, 205,728 currently live websites and an additional 269,705 domains that redirect to sites in this list. 728,892 sites that used this technology previously and 128,477 websites in the United States currently using Enquire JS.