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Re:Mozilla says Chrome’s latest feature enables surveillance by kevingadd on Friday September 24, 2021 @12:25AM (#28638624)
Interestingly, this API is one of the tools Youtube uses to stop you from playing videos in the background on mobile.
Re:Mozilla says Chrome’s latest feature enables surveillance by mrsalt on Friday September 24, 2021 @12:46AM (#28638720)
Here's an old thread about this: https://news.ycombinator.com/item?id=21244440

It's obvious when you the Page Visibility API original editors/authors: https://www.w3.org/TR/page-visibility-2/