doc-src/templates/default/layout/html/headers.erb

<meta charset="<%= charset %>">
<title>
  <%= h @page_title %>
  <% if options.title && @page_title != options.title %>
    &mdash; <%= h options.title %>
  <% end %>
</title>
<% stylesheets.each do |stylesheet| %>
  <link rel="stylesheet" href="<%= url_for(stylesheet) %>" type="text/css" media="screen" charset="utf-8" />
<% end %>
<% javascripts.each do |javascript| %>
  <% if url_for(javascript) == '../js/app.js' %>
    <script
      type="text/javascript"
      charset="utf-8"
      src="<%= url_for(javascript) %>"
      id="app-script"
      pathid=<%= @path ? @path.inspect : 'null' %>
      relpath='<%= u = url_for(''); u + (u != '' ? '/' : '') %>'></script>
  <% else %>
    <script type="text/javascript" charset="utf-8" src="<%= url_for(javascript) %>"></script>
  <% end %>
<% end %>