I'm very surprised VBScript support has hung around this long. Silverlight, which came out to replace VBScript as Microsoft's proprietary anti-compatibility system is long gone. I've been a professional web developer for 10 years and even before that I don't recall a time where VBScript was a reasonable option for programming client-side scripting. Even thinking back to when I was in high school having a web application that only works in IE doesn't make any sense.