Our default off-topic is currently:
This question does not appear to be about $Topic within the scope defined in the [help/on-topic].
I find "webmastering" as the
$Topic to be fairly awkward. I'd like to change this wording.
Moderators can edit this reason here. The help on this page has this to say about this close reason:
Shown when no 2 off-topic reasons match on a closed question.
So this isn't a close reason that users can select from a list, this is shown when consensus on the close reason can't be reached.
Please answer if you have a suggestion of what you would like this message to be. I have a suggestion of my own.