Hi,
I'm not sure I understand what you are looking for.
If you are looking for the html for the entire listing you can select the listing, choose Edit and when the page opens go to View > Source in the IE menu bar and you will get ALL the html for the listing.
If you are just looking for the html for your descriptin select the Text mode in Switch to and that will give you the html for the description.
Not sure this is exactly what you wanted, but it does get the html for your listing.
BroJames