selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8.
http://selectivizr.com/
JavaScript Libraries and Functions · Compatibility
Get access to data on 2,153,500 websites that are selectivizr Customers. We know of 778,486 live websites using selectivizr and an additional 1,375,014 sites that used selectivizr historically and 416,720 websites in the United States.
Get a list of 2,153,500 websites using selectivizr which includes location information, hosting data, contact details, 778,486 currently live websites and an additional 348,474 domains that redirect to sites in this list. 1,375,014 sites that used this technology previously and 416,720 websites in the United States currently using selectivizr.