I have noticed a behaviour that may or may not be a Markdown bug. It is a discrepancy between the preview and the rendered result, which is why I would need to post a question to check it out.
Is there an official place to do that?
Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange
Meta Stack Exchange is a question and answer site for meta-discussion of the Stack Exchange family of Q&A websites. It only takes a minute to sign up.Sign up to join this community
The formatting sandbox does not really fit as it can only accept answers, not questions.
So, such thing as "questions sandbox" is not really possible since what you really ask for is a sandbox site, which does not exist.
If you really must test posting a question just do it, make sure to make it clear it's just a test (do NOT post stuff like "sjksjdidjs") and delete it asap right after posting it to minimize the noise.
It's not publicly accessible, but if you have Stack Overflow for Teams and your team is OK with posting test questions, you could use that. Of course, if your investigation does reveal a question-only Markdown renderer bug, you'll need to post it here anyway, but your experiments won't annoy other Meta Stack Exchange users.
Teams even has (limited) API access so you might be able to use it as a sandbox for read-only actions in apps; it has a 14 day free trial mode.
This will not work to test out Winter Bash hats, as Winter Bash is disabled in internal Teams sites for privacy reasons.
?team=". (But the
?teamis mandatory, isn't it?) May 23, 2019 at 14:40
Why not try it on your question and then change it back when you are done? Can you not edit your own question?
If it works, maybe you could describe it and change this to a bug.