As you can see in the screenshot, the same rules seem to apply that we mentioned when YouTube made the new aspect ratio available on the main site: “For all videos uploaded in the standard 4:3 aspect ratio, they’ll appear inset, but the increasingly more common 16:9 videos will fill all available space.”
In addition to the bottom chrome on the player window, there also appears to be a fairly large search bar across the top of the embed, firmly implanting into anyone within a five mile radius that this is, indeed, a YouTube embedded video.
We had about two gazillion responses when YouTube announced the change to 16:9, most of them were negative. Those that weren’t negative seemed to be ridiculing the folks who didn’t like the change:
“Finally! It’s about time.”
“People complaining about this should get their head out of 1984 and buy a real tv/monitor (16:9).”
“aaaaagggghhhhhhh!!!! Change!! I hate Change!!!! How _dare_ YouTube?!?!? This RUINS EVERYTHING!!!! I’m so confused. First Daddy takes away my Porsche, Now THIS!!! I’m calling my Senator! This is so unfair. Like, I want things the way I know them already!!”