Arma has RscHTML class in confing.
It is can load HTML files by command like _html htmlLoad "first.html";
But links to the sections of html files is broken.
Tags for this function do not work. For example, this

<a name="FirstSec">This is the first section!</a>
<p>If click on this <a href="#SecondSec">Link</a> the control will bring up the second section.</p>
<hr>
<a name="SecondSec">This is the second section!</a>
<p>If click on this <a href="#FirstSec">Link</a> the control will bring you back to the first section.</p>
<hr>

Control show first section, show text with link, but click on link return nothing.
This broken feature is really need for diary or other custom campaign elements.