Annoyingly enough, that website doesn't actually show the tin itself, which seems would be the first thing that comes to mind when someone hears the story.
Inspired by the news that Google Workspace will soon require JS in order to log in, I made this to send our users for diagnosing issues. Nothing fancy.
If you had to answer the question "Is JavaScript Disabled?", then <noscript> would have worked fine. But to answer the question "Is JavaScript Enabled?", you'd still have to have at least some amount of JavaScript code, as there is no <yesscript> tag (yet?)
If you're curious:
https://www.ronseal.com/the-ronseal-phrase/