I'm all in favour of encouraging the asked posting a jsFiddle/jsbin/whatever example in addition to posting at least some code in the question, but I'm absolutely against only posting a jsFiddle example.

If a question is at all unclear without the jsFiddle example, I think it's an unacceptable dependency. There are any number of ways the example could become unavailable (e.g. asker deletes it, jsFiddle changes its URL scheme, jsFiddle ceases to exist, jsFiddle gets bought changes its name, jsFiddle has a big outage...)

I'm all in favour of encouraging the asker to post a jsFiddle/jsbin/whatever example in addition to posting at least some code in the question, but I'm absolutely against only posting a jsFiddle example.

If a question is at all unclear without the jsFiddle example, I think it's an unacceptable dependency. There are any number of ways the example could become unavailable (e.g. asker deletes it, jsFiddle changes its URL scheme, ceases to exist, gets bought and changes its name or has a big outage...)