Lift provides powerful facilities to build highly interactive web applications.
Ajax
Lift has powerful set of Ajax features that all you to
create Ajax controls with as little as 1 line of code:
ajaxButton("", s => {println("you said: "+s); SetHtml("place", <b>{s}</b>)})
Comet
Lift supports Comet-style long polling with very little work on the
part of the developer. Here's the code the implements the clock
that you see in this demo: