No, just one global stylesheet that all websites obey without breaking. The (dead) dream of the ideal user agent is a program that lets you browse with your pre

No, just one global stylesheet that all websites obey without breaking. The (dead) dream of the ideal user agent is a program that lets you browse with your preferred color scheme, fonts, font size, etc; websites look just like any other program. Or not, if you prefer. Content is dictated by the authors but appearance is dictated by the user-agent. The idea of the user agent dictating presentation rather than the content author is kind of dead on today's modern web; while it's certainly possible to set a global stylesheet, doing so creates an incredibly frustrating game of trial-and-error as some websites break while others work fine. The idea does live on outside the mainstream in ideas like Gemini, Gopher, and a small subset of the Web that focuses on textual content with very conservative progressive enhancement. I wrote about this previously: https://seirdy.one/2020/11/23/website-best-practices.html https://seirdy.one/2020/11/23/website-best-practices.html Most websites should be able to work just fine with nothing but HTML. That doesn not mean that they should actually be just HTML (my website certainly isn't); it means that enhancements like CSS and JS should be progressive. Exceptions exist, obviously.