title: Why is javascript the only client side scripting language implemented in browsers?
body: <p>Why don't browsers add support for, say, Python scripting as an alternative to Javascript? Or more general purpose scripting languages? Is there a reason that Javascript is the only one implemented across browsers? After all, the script tag does have support to specify the scripting language used.</p>
  
  <p>(I know there is VBScript support in IE, but it seems obsolete for all intents and purposes.)</p>