Since answering your own questions is encouraged, I am planning to document a few things I unnecessarily retype from time to time (answering other questions). These are general (though focused) questions and I would like to write a longer answer to have everything in one place.
Let's say that the question is "what is the optimal length of a password?", posted on Information Security SE.
In the body of the question, I would have just mentioned the context: that the question is about passwords in specific operating systems and web applications, threat model etc.
I believe that the whole part of "what research have you done / what have you tried so far", is neither needed, nor useful (as I do not want to show that I did some efforts, that will come in the answer).
Is it OK per the rules to keep a trimmed-down body of such self-answered-to-be question?
EDIT: I edited this question to mention the actual question I would be asking, instead of a general one ("what is the best height of a chair"). Apologies if this is not understandable because too technical -- I took into account the comments about "too broad" expressed in the answers.