CSS3 support for HTA

Question

Is HTML5 and CSS3 supported by HTA? If I am planning to use my application only with Windows operating system: It is a simple application that does some basic file handling,

Answer 1

HTAs not only support everything a webpage does—namely HTML, Cascading Style Sheets (CSS), scripting languages, and behaviors—but also HTA–specific functionality. This added functionality provides control over user interface design and access to the client system.

http://msdn.microsoft.com/en-us/library/ms536496(v=vs.85).aspx