User-style-sheets sound great in theory, but CSS is Cascading Style Sheets which means it would be very easy for users to break functionality of web-sites. For instance make the cascade cascade so that the text-color is same as background color on some widget on some website and you might be missing a button.
A user's custom style-sheet might be good for one web-site, but not for every website.
The original web was much about self-expression of developer-users, but now the web is all about apps, which must not break because a user might want to use different colors.
And why should you need to customize colors? I can understand that different users need larger fonts which you can do by zooming in the browser. Colors should be good to go if the website is well-styled to begin with.
> User-style-sheets sound great in theory, but CSS is Cascading Style Sheets which means it would be very easy for users to break functionality of web-sites. For instance make the cascade cascade so that the text-color is same as background color on some widget on some website and you might be missing a button.
Pretty sure AI-driven style derivation will finally deliver the dream of custom stylesheets in a robust and automatic way.
> Colors should be good to go if the website is well-styled to begin with.
What if it is not well-styled? Or, maybe some people think it is and others disagree and want something else. The end user should need to customize fonts (not only larger, but also if you want smaller fonts; I more often find the fonts on a web page are too big and want smaller fonts; however, also you might prefer a specific font typeface and not only the font size), colours (also for many reasons, including using a monochrome display or printer that the web page author might not have been aware of), animations (e.g. to disable them), margins, etc.