It's common for sites to include messages that show up when the user has disabled JavaScript (or JavaScript fails to load) and request the user to enable JavaScript in order to fully experience the site, or even access it at all.
At SN we follow progressive enhancement principles so JS being disabled shouldn't be a problem, but there may be a few instances where this could be acceptable.
We need to document this, and suggest an appropriate wording for a message like this that respects the users' choice and doesn't link to external sites.