I tested the Playground minimally with Firefox and Edge in Win10.
I started with the landing page at
https://code.jsoftware.com/wiki/Playground
In Term, if you type "t", you get
t
+------------+-----------+----+------+-----------+----+-------+
|invalid name|not defined|noun|adverb|conjunction|verb|unknown|
+------------+-----------+----+------+-----------+----+-------+
In Term (after reloading the page), if you type ";" followed by Ctrl+F1
(Contextual Help), the input line goes away and you get
|value error: helpplay_jws_
| helpplay_jws_'0 0 1 1 ;'
|[-0]
~ Gilles
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