User blog comment:DaNASCAT/Technical Update: May 8, 2012/@comment-3441771-20120509033114/@comment-957747-20120510200444

Also, all HTML is SUBST'd when posted. If I put &amp;lt; here as a tag, like... &lt;test>. Once it's saved, the &amp;lt; is no longer &amp;lt;, it is now < when I attempt to edit the code. The reason for the &amp;lt; in the first place was so it wouldn't be evaluated as a < and yet when the text is saved, it is converted to a < (or rather is converted to < when attempting to edit.)

If it's not noticed when you edit/save, the &amp;lt; could ruin formatting you choose to not show previously. For instance, if I have &amp;lt;code> in my code here to show someone how to use the &lt;code> tag, and I re-edit this to change something. That &lt;code> tag will now show most of this paragraph in as if it was in the code block.