Do more on the web, with a fast and secure browser!
Download Opera browser with:
Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
I checked that on all sites except *.vk.com the document.pictureInPictureEnabled property = true and only on *.vk.com it is false 
leocg