Hi John,
I' have used it on this website:
https://www.wbkessen.de/
(on the pages index.html and kuenstler.html).
According CanIUse it has a global usage of 74%.
Of the major modern browser only Safari has not yet implemented some kind of support.
But, that's okay, since the things a browser do not understand are ignored. The page still renders.
And , that's a reason to try it out.
Btw. this website is not optimized for older browsers or IE.