<span class="underline"> should be <em>

[Pankaj Jangid]

For this org mode text:

#+begin_src org
- This text is /emphasized/
- This text is *in bold*
- This text is _underlined_
- This text uses =a teletype font=
#+end_src

the follow is the HTML output:

#+begin_src
<ul class="org-ul">
<li>This text is <i>emphasized</i></li>
<li>This text is <b>in bold</b></li>
<li>This text is <span class="underline">underlined</span></li>
<li>This text uses <code>a teletype font</code></li>
</ul>
#+end_src

In case of /italics/, CSS class is used whereas for other formatting
cases native HTML elements are used. Shouldn't the _underline_ be
converted into <em> tags?

Regards