The brightness of the site should be under user-agent control somehow anyway. There are extensions (e.g. dark reader) that try to generically make websites dar

The brightness of the site should be under user-agent control somehow anyway. There are extensions (e.g. dark reader) that try to generically make websites dark using graphics filter and CSS tricks. This approach mostly works, but fails pretty badly in some cases. It'd be nice if this client side color adjustment were standardized and website makers testes their sites with it. This way, each person could make sites as dark as he wanted.