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 999,242 websites that are Enquire JS Customers. We know of 231,045 live websites using Enquire JS and an additional 768,197 sites that used Enquire JS historically and 148,920 websites in the United States.
Get a list of 999,242 websites using Enquire JS which includes location information, hosting data, contact details, 231,045 currently live websites and an additional 302,558 domains that redirect to sites in this list. 768,197 sites that used this technology previously and 148,920 websites in the United States currently using Enquire JS.