https://i.judge.sh/hot/Flare/chrome_eC7WqUYKPX.png
https://i.judge.sh/mealy/Sparkle/chrome_5RItK5j3Yl.png
Edit: Doing some digging, on the iOS user agent, the `toolbar` portion is null, while with the Chrome windows user agent it's set to include the entire element:
https://i.judge.sh/flickering/Twilight/chrome_q978GUiwQ8.png
https://i.judge.sh/pleasant/Coco/chrome_cNh0eBIHQL.png
This looks to be the function that determines it:
https://i.judge.sh/qualified/Velvet/chrome_CxUBug0q1P.png
So it's just a 'if mobile' check - maybe it breaks on some mobile screens (on a iphone 5/SE you end up being unable to view the channel name, not that it's an enjoyable experience anyways https://i.judge.sh/brave/Flare/chrome_nW26bTRXDe.png) or maybe it's a motive to get you to use the mobile app. This is just the desktop UI with some `if mobile` checks probably thrown in by a small number developers that want to support mobile browser support but aren't getting paid to do it.