<%= blueprint "my-template" do %>
  <div id="${id} class="content">${content}</div>
<% end %>
...
<%= require_blueprint "my-template" %>
...
<%= render_blueprints %>
  #=>
    <script id="my-template-blueprint" type="text/x-jquery-tmpl">
      <div id="${id} class="content">${content}</div>
    </script>

<%= f.errors >

build_html do |b|
   b.div( id: "foo" ) {
     b.span {
        b << "bar"
     }
   }
 end

<div id="fields">
  <%= f.fields_for :nested_attribute do |n| >
    <%= n.text_field :foo %>
    <%= n.link_to_destroy "Delete"
  <% end %>
</div>

<%= f.link_to_create :nested_attribute, "New attribute", placeholder: "#fields"