As shown YouTube advance technology. Why; With an important update on image quality, he added HDR video support.
If you do not know what this means, HDR videos are somewhat similar to HDR photos, in that they allow more tones between the brightest and darker parts of the image.
Of course, the full range of tones of color is missing (the table showing the differences between the different tones of a color) which means you will not be able to see the difference.
So the HDR probably will not be fully appreciated by most Youtube users, let most of us have no 4K TV, let alone one with HDR.
The company also announced that at the moment you will not be able to edit HDR videos uploaded with the Youtube Web editor. For more information about HDR and color gradation, you can see it Google support page.
HDR is coming to Chromecast Ultra today, and "soon" on all Samsung 4K TVs (although the full range of colors and brightness will only appear on those with SUHD panels).
There is currently no mention of the Xiaomi Mi Box or the Nvidia shield, both of which support HDR, although Google says more devices will follow later.
If you have a compatible device, you can try some video samples in the playlist below.