[Versão em Português? Clique aqui.]
One way of doing that is by using
noscript elements with the description, the warning or an alternative feature. Say, for example, an static image instead of some kind of interactive graphic.
The good news is that you can solve that by using a WordPress filter. Specifically, by using the
script_loader_tag, as you can see below.
Enjoy! This function is also available on Github.