Le site semantic-ui.com est-il sûr ?

Well, it's a development framework, so I'm assuming it's not going to put malicious code on paying users webpages... However, I can't guarantee that. Further, I'm looking this strictly from the perspective of whether I'm gonna allow it with uMatrix browser extension. I want to keep unnecessary things disabled - and the page I was on worked fine without it, so I'll leave it disabled. But if it needed it to function, I'm sure that the other extension based on HTTP Switchboard (as is uMatrix), uBlock Origin will most likely keep any ads or malicious code out of my browser even if I allow scripts in uMatrix. Just mentioning, so you know what point am I looking this from...