Comment by tacotime

On my macbook with vscode on the left and chrome on the right. When I click on this link with the right side of my screen covered up, I can visibly see vscode on the left get a couple of shades darker (animated over a second or so). So it looks like it's not only a question of hidden max brightness, it looks like the device adjusts the whole screen to enhance contrast for the HDR content as part of the strategy.