treecle

I believe they do it this way because they want to be able to display HDR and SDR content on the same display at the same time.

Apple does some trickery to display HDR on non HDR Apple displays. Look up EDR.

It's an HDR video and it's the OS that controls how it looks. If your display is HDR (OLED and Mini LED Apple displays) it will brighten just the video pixels. If your display is not HDR, it will do as you describe (across the whole OS, not just the webpage). Apple calls this EDR I believe.

Then who is leaving all the faeces on the streets of Paris?

The context here is that the BBC recently produced a documentary about Modi that has been controversial in India. Hence the attack on Churchill and the explicit mention of the BBC.