State of the Web in 2010: CSS3, HTML5, JQuery Use Growing
As far as operating systems, web developers prefer the Mac OS, with 50% preferring that OS over Windows which only 41% of those surveyed reported using, which is down from the 2008 survey. On the other hand, while Internet Explorer still maintains a lead among internet users in general, web developers strongly prefer Firefox according to the survey.
While HTML5 is continuing to rise in use, only 7% said they normally use the language, and 21% said they sometimes use it. There were fewer developers who said they never use it at all. The most often used Application Programming Interfaces (API) were geolocation and client-side storage.