railties/assets/application.rhtml

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title><%=h @title || "Rails Application" %></title>
    <%= javascript_include_tag :defaults %>
    <%= stylesheet_link_tag "application" %>
  </head>

  <body>
    <%= yield %>
  </body>
</html>