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 876,868 websites that are Enquire JS Customers. We know of 237,891 live websites using Enquire JS and an additional 638,977 sites that used Enquire JS historically and 154,450 websites in the United States.
Get a list of 876,868 websites using Enquire JS which includes location information, hosting data, contact details, 480,449 currently live websites which includes 242,558 domains that redirect to sites in the list. 638,977 sites that used this technology previously and 154,450 websites in the United States currently using Enquire JS.