In html, you can do something like this
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eget
aliquet odio. Fusce id quam eu augu
As a hybrid of these nice answers by others, I think you can define a Helper method in your application_helper.rb for some inline markups you'd frequently use. You don't need to mix HTML with HAML, nor do you have to type much.
In your helper;
def em(text)
content_tag(:em, text)
end
#def em(text)
# "#{text}".html_safe
#end
In your haml;
%p
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Praesent eget
aliquet odio. Fusce id quam eu augue sollicitudin imperdiet eu ac eros.
#{em 'Etiam nec nisi lorem'}, ac venenatis ipsum. In sollicitudin,
lectus eget varius tincidunt, felis sapien porta eros, non
pellentesque dui quam vitae tellus.