anchor.diff:  
       <%= f.input :name, :wrapper => :prepend, :label => false do %>
         <%= content_tag :span, "Name", :class => "add-on" %>
  -      <%= f.text_field :name %>
  +      <%= f.input_field :name %>
       <% end %>
   
       <pre>
   f.input :name, :wrapper => :prepend, :label => false do %>
     content_tag :span, "Name", :class => "add-on"
  -  f.text_field :name
  +  f.input_field :name
   end </pre>
   
       <%= f.input :content_type, :collection => content_type_options,
  
positive.code:       <%= content_tag :label, :class => "add-on" do %>
          <%= check_box_tag :remove, 'true' %>
        <% end %>
        <%= f.text_field :disabled_text %>
      <% end %>
  <pre>
  f.input :disabled_text, :wrapper =&gt; :prepend do
    content_tag :label, :class =&gt; "add-on" do
      check_box_tag :remove, 'true'
    end
    f.text_field :disabled_text
  end
  </pre>
  
      <%= f.input :disabled_text, :wrapper => :append do %>
        <%= f.text_field :disabled_text, :class => :mini %>
        <%= content_tag :label, :class => "add-on active" do %>
          <%= check_box_tag :remove, 'true' %>
        <% end %>
  
negative.code:   <% end %>
  <pre>
  f.input :disabled_text, :wrapper =&gt; :append do
    f.input_field :disabled_text, :class => :mini
    content_tag :label, :class =&gt; "add-on active" do
      check_box_tag :remove, 'true'
    end
  