You are miss understanding the purpose of ColdFusion.
ColdFusion is a server side technology. 90% of the functionality built into ColdFusion is designed to hand what happens on the server between web requests.
There are some ColdFusion tags that DO generate some User Interface elements for you, but the tend to be for more advanced items like grids, calendars, ect.
A simple button, there isn't much reason to re-invent the HTML wheel of the <input type="button"....> tag. Though there is the <cfinput type="button"...> tag that may give you some more functionality.
I am not actually sure I have ever used a <cfinput type="button"...> tag before.