A disabled button is marked up as follows:

Edit code and click me	Your Result (Some examples do not work in Google Chrome):
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> </head> <body> <button type="button" disabled="disabled">Click Me!</button> </body> </html>
Edit the code above and click to see the result	www.xhtml.co.il - Try it yourself