Right now, if you try to post a jsFiddle link without posting code, the site says this:
Links to jsfiddle.net must be accompanied by code. Please indent all code by 4 spaces using the code toolbar button or the CTRL+K keyboard shortcut. For more editing help, click the [?] toolbar icon.
Sadly, we get people just marking up the link as code to work around it:
When this happens, the better part of me wonders if the OP simply didn't understand. (The other part of me has a more harsh opinion, but I strive for my better self.)
Particularly for the many for whom English is not a native language, if you turn your head sideways and skim, you could read the message as telling the user to mark up the link with CTRL+K.
I suggest making the message more direct, opening with a clear statement that code must go in the question:
The code for your question must be in the question, not just linked. Copy the code from jsfiddle.net into your question, and mark it as code by selecting it and using the code toolbar button (
{}) or pressing Ctrl+K. For more editing help, click the [?] toolbar icon.
And as there's a similar rule for answers, the same thing with "question" =>"answer" in that case. (I would not try to have a generic message for both using "post" or similar — again because of English as a second/third/fourth language. I would be as specific as possible, using separate messages for questions and answers. Easy enough to swap in the right word when showing it.)
Related: Broaden the jsFiddle (et. al.) filter to disallow links as the only code