To answer the question, I get info from many both MSFT and non-MSFT sources -- usually indicated by authors of major tools (Jquery, Modernizr, etc.) Note though that responses you collect here will likely over-represent Microsoft tech (since that's where many people know you from). You need to ask the question from a more "neutral" place (like the jQuery blog). I'm not surprised that many don't know about IE features since IE's profile is relatively silo'd in Microsoft properties. For example, if someone searches Google for "HTML5" one of the top results is the Google-centric HTML5 Rocks site. Once people go there, they are on a path away from IE. Microsoft needs to be better at raising their profile in the web world (and playing SEO).