Comment by pcwalton

6 years ago

How many sites put invisible DOM elements over the videos?

Remember, if you put visible DOM elements on top of the videos, then you lose scanout compositing no matter what.

4 comments

pcwalton

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magicalist  6 years ago

> How many sites put invisible DOM elements over the videos?

A lot of them? Vimeo, for instance, has a number of opacity: 0 and hidden divs over the video. Twitch has at least a couple of opacity: 0 divs on top.

Maybe we're interpreting the phrase

> hidden empty div over YouTube videos

differently? That's the structure I assume they were talking about.

  • seba_dos1  6 years ago

    I'd assume that it was actually an invisible, but not technically hidden div, leading to a fully transparent blending pass - divs with opacity:0 or display:none are trivial to optimize for this case.

    • magicalist  6 years ago

      > I'd assume that it was actually an invisible, but not technically hidden div

      Considering that it's now optimized and that's not what the original post said, I don't know why you'd assume that.

catwell  6 years ago

There are visible elements on top of YouTube videos.

That's what this "empty div" is for if that's the one I think it is. It is the container for things like branding and annotations.