Sorry, this reminds me of people who go to Upwork to get a Facebook clone written in a weekend for $600. Writing a rendering engine for CSS and an interpreter

Sorry, this reminds me of people who go to Upwork to get a Facebook clone written in a weekend for $600. Writing a rendering engine for CSS and an interpreter for javascript are not trivial. Plus you have to make them secure. And deal with all sorts of edge cases. And that’s before we even get to the HTTP stack, cookie and local storage handling, etc. Let alone expected browser amenities like bookmarks and (secure) extensions. And then make it cross-platform, including supporting older versions of a bunch of operating systems, and all sorts of hardware configurations, several dozen languages, RTL input...