my opinion is that html is not too hard too read, so I don't think that adds any value
from their tutorial <strong class="code" id="message">Hello, World!</strong> %strong{:class => "code", :id => "message"} Hello, World! <div class='item' id='item<%= item.id %>'> <%= item.body %> </div> .item{:id => "item#{item.id}"}= item.body I don't spend too much time to write html so I don't see any real advantage, and now it even looks strange ... my 2 cents