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.
Re:Browsers
by magicalist on Monday December 17, 2018 @08:46PM
(#18703922)
> 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.
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.
Re:Browsers
by magicalist on Tuesday December 18, 2018 @03:43AM
(#18705284)
> 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.
which, again, that's fine, but mayyyyybe they were a little lax in checking performance on nearly any other popular video site on the web to see if that heuristic is a good one?
Or maybe changing page layout in an extremely common way wasn't an effort to undermine a hyper specific benchmark?