Twitch player injecting elements into page

Because I’ve seen this multiple times before, and in every prior case it was always adware in some shape or form (the most recent was a proxy running on localhost that injected ads into some pages).

If it’s only shown outside of the US, then it may explain why I cannot reproduce this. A network log from page load onwards when this issue occurs would be helpful.

So if you pause AdBlock completely, is it reproducible?

Here’s a modified test version with script access disabled. Is it reproducible here?
http://nightdev.com/testing/noscriptembed.html