<stackTemplate theme="dark" class="background"> this would do it: There's a theme property that a template element can take. This theme defaults to "light", and by change it's value to "dark" it would make the text color lighter. Combining this with setting the background-color style property of the template element would do the trick. To get you a light text and a background color of your choice.

Same here, developing a tvOS app. When using the mediaPlayer.play() method, it would display a black screen, it won't play the video that I'm providing, and it would log that "screen params are unexpected" error. Not sure how to go about this. I haven't find any solution yet, neither have been able to resolve it by myself

Did you find any solution to this? Facing same hurdles

Just edited the post to change that. StreamGestureManager is not a thing. It got copied over.