On Stack Overflow it is considered acceptable to ask a question to which you know the answer, and then post the answer as an answer (not as part of the question). Similarly, it is acceptable to ask a question and then post a possible answer amongst others answers.
Here on UX, I have posted a design question. (Embarrassingly, I somehow posted it to meta here instead of the main site, but it's now been migrated.) In pondering the question I have come up with my own design ideas. When (and why) would it be appropriate to include these 'answers' in the question, versus posting them as answers for independent consideration?
I provided two possible answers to the question, and they have been deleted and edited to be part of the question. I'm less concerned about this particular question and answers, however, and more interested in general arguments regarding this behavior.