in reply to
Re^2: Kill your "Comment" before you post since it's incorrect?
in thread Kill your "Comment" before you post since it's incorrect?
I don't know the code, but I'm 99% sure that starting a comment does not save anything into the server's database until you really submit it, so going back or closing the window is really enough ;-)
IIRC, technically speaking, it might reserve a row/node_id theoretically, and might save content into a session/cache table that gets emptied often, but none of this is matters as there is no "cancel" option