MediaWiki provides "basic" support for no-JavaScript viewing. It is
targeted towards browsers that do not support JavaScript very well or at
all, but modern browsers with JavaScript disabled by the user get the
same experience.
https://www.mediawiki.org/wiki/Compatibility#Basic_(Grade_C)
"In the front-end this means content is presented in a readable manner,
and to some extent user actions can be performed, but these browsers do
not get JavaScript features."
For example, reading and editing pages is possible without JavaScript,
although you do not get some fancy features, such as e.g. sortable
tables or editing toolbar.
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Bartosz Dziewoński