It is possible to get the feature Stack Snippet also on WPSE?
I think is much helpful to understand the answers, the snippets and easy to see how it works. Currently we use often jsfiddle or similar.
Every question is better for having minimal, reproducible code. Right now the best way to tell people to do that is to point them to JSFiddle, which is off-site. Using this feature, we plan to push new posters to embed runnable code that reproduces their problem.
Similarly, answers that include runnable code are easier to use and understand, because you can try them out. Obviously JSFiddle is hugely popular in answers already, so we just wanted to make it even easier to use.
Obviously the same rules apply: code-only questions or answers will still be blocked (and, in fact, because of how it's implemented all the existing checks will just work out of the box).