This “issue” is still here on Meta (example in the OP of this topic https://meta.discourse.org/t/cross-origin-framing/26984) exactly as described by @erlend_sh
I think that new user can be really in difficult to understand what’s happening, the only way to see what is wrong is open the browser console and look at the error Not Found.
Change Loading... with This post was deleted, as @codinghorror said above, is a good compromise to me.