macOS Sierra weirdness in Beta Player

Beta allows playing HTML5 source on new videos, but current player complains that I don't have Flash installed. Switch user agent to iPad and I see the beta opt-in.

In the beta player, right click is broken/blocked, so macOS Sierra Picture-in-Picture doesn't work.

Fill Window option is in unfamiliar location compared to current player.

Can't enter Fill Browser if Embiggen is already enabled.

The Beta invite button on iPad also seems to interfere with the non-fullscreen default Quicktime player control bar.

Still can't Picture in Picture on macOS Sierra on the new player.

it also seems to load endlessly?

I too have an issue with endless loading on sierra (the circle continuously circulating throughout playing).

I thought the picture in picture for sierra wasn't native to all videos but rather the developer has to tap into the API, maybe new WebKit api. I didn't look that hard when I first saw the feature.