**NOTE** Craigslist states to use "html sparingly". The Craigslist community is known to frown upon posts that have too much HTML or look too commercial. Click Here to read about it at the Craigslist help desk. If your Craigslist posts look too commercial or have too much HTML they will have a higher chance of being flagged or blocked by the Craigslist community.
Are your Craigslist ads being blocked or ghosted without you even knowing it? Craigslist has recently added new filters into their system that will ghost (hide) ads from the Craigslist search results that have too much html. The scary thing is you may never even know this is happening because you are not informed of it. You will get a Craigslist confirmation like normal but your ads will not appear anywhere in the search. It isn't consistent either but more and more people are complaining that they are getting blocked from Craigslist due to this (see here).
So you should ask yourself - is it more important that you post full color html ads to Craigslist that may get ghosted or even worse get you blocked? Or would it be better to post a more Craigslist compliant ad with little HTML and have your ad actually show up in searches and lessen your chances of being blocked?