Details of proposed permitted HTML tags have been for review by the users on the craigslist site and is available here http://www.craigslist.org/about/help/html_in_craigslist_postings
The proposed allowed tags are :
- basic text formatting tags like <B> <U> etc.
- Line breaks : <BR> <p>
- Horizontal line <hr>
- Headers : <H1> <H2> ... <H6>
- Unordered and ordered lists: <UL> <OL> <LI>
- Dictionary lists: <DL> <DT> <DD>
- Hyperlink: <A>
- Image : <IMG>
- Preformatted text: <PRE>
- Table: <table> <TR> <TD>
Discussion on this proposal is going on craigslist's help forum. Checkout this. It seems most of the users are supporting the move. So it may be anticipated that craigslist will limit use of HTML as soon as it can finish necessary software updates.