Maybe it has already been asked (couldn’t find it though), but does https://julialang.org/learning/tryjulia/ still work? It’s the fist in Google search results for Julia playground, but it doesn’t seem to be functional 
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This doesn’t answer your questions about that link, but you should see this recent discussion about the feasibility of an online Julia playground Julia online compiler
ah, right, that’s a lengthy discussion, thanks.
I’m not pro or against playground per se, but against orphaned/outdated pages for sure.
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That online REPL is also linked under these buttons in the first section of the https://julialang.org/ homepage.
Neither webpage immediately worked for me (at least without an account).
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