[GoblinSlayer]

I'd say, web standards are an antipattern anyway. Look at this dark theme: https://randomnixfix.wordpress.com/2021/10/23/why-the-freebs... should such things be supported? If not, how much effort would a browser implementation take?

[forty]

Enabling reader mode on my already existing Firefox web browser makes this page perfectly readable.

So very low effort as it already exists :)