form.haml

/ Although from the user's perspective we are requesting a "username", we'll use Twitter's nomenclature
/ for this field and call it screen_name in our code instead. By using the same names as the API you 
/ interact with, you decrease the cognitive overhead of dealing with the API.
%form{:action => "/value", :method => "post"}
  Enter your Twitter username:
  %input{:name => "screen_name", :type => "text"}
  %input{:type => "submit", :value => "Submit"}