As in title, I wanted to check wiki for stuff and homepage is broken
Screenshot:

Yeah, I saw this as well. I hadn't changed anything with the wiki though, and after a while this was fixed again for me.
If you are still experiencing this, try clearing your cache of the GitHub domain.

clearing cache of the GitHub domain fixed it for me

GamyGamer, has the wiki fixed for you, and if so about how long did it take? I have cleared the cache and waited for a little over an hour and it still has not worked.

Having the same issue here. No fixes, and it's been happening for about an hour or two.

I will close that, it looks like Github had some temporary problems with parsing html, it fixed for me after 3 hours (could be earlier but I was not looking at page back then)