first you check in code like this
<!-- FIXME STEVE -->
<!-- FIXME STEVE -->
<div class='STEVE'>
<% unless Rails.stage and Rails.stage.production? %>
<%
@hero = Article.hero.limit(1).to_a
@featured = Article.featured.limit(3).to_a
%>
<div style='border:4px dotted orange;'>
<h1> HERO </h1>
<% @hero.each do |article| %>
<div style='height:12em;overflow:scroll;border:2px solid pink;'>
title: <%= link_to article.title, article %><br>
<%= article.to_html %>
</div>
<% end %>
</div>
<div style='border:4px dotted fuchsia;'>
<h1> FEATURED </h1>
<% @featured.each do |article| %>
<div style='height:4em;overflow:hidden;border:2px solid purple;'>
title: <%= link_to article.title, article %><br>
<%= article.to_html %>
</div>
<% end %>
</div>
<% end %>
<script> $(function(){ App.blink('.STEVE') }); </script>
</div>
<!-- FIXME STEVE -->
<!-- FIXME STEVE -->
renders like
and then you just sit back and wait ;-)