The Yahoo! User Interface (YUI) Library is a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX.
https://developer.yahoo.com/yui/
JavaScript Libraries and Functions · JavaScript Library
Get access to data on 9,853,855 websites that are Yahoo User Interface Customers. We know of 3,843,629 live websites using Yahoo User Interface and an additional 6,010,226 sites that used Yahoo User Interface historically and 2,612,660 websites in the United States.
Get a list of 9,853,855 websites using Yahoo User Interface which includes location information, hosting data, contact details, 3,843,629 currently live websites and an additional 2,330,792 domains that redirect to sites in this list. 6,010,226 sites that used this technology previouslyand 2,612,660 websites in the United States currently using Yahoo User Interface.
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