If you think you might know an answer, or have a good suggestion, should it be a comment or an answer?
Say you don't have the time currently to test your idea, or you are 80% sure, should this be a comment on the original post 'Have you tried... ?' or should you post it as an answer, and if it is voted up, accepted as the answer or you finally test it and confirm it, it is then edited to reflect the new stance.
Example (using simple CSS)
First Post
Have you tried setting its display to inline?
Revision after being accepted
Simply set its dispay to inline
example:
#element {
display: inline;
}
In the past, I have made a suggestion in the comments, and it has been correct, and then someone else posted it as an answer which was accepted. After I posted it as the answer later however, I received the accepted answer.