alt Hacker News> Selectors are a global namespace. Imagine if every variable and function in your favorite programming languages were global and so had to be unique.
A selector is not not a variable or a function. CSS has functions (e.g translate) and it has variables, which are both distinct concepts in the language from selectors.
> No modules or namespaces. CSS is not supposed to be a turing complete general purpose programming language. Why would you need namespaces and modules to style up HTML tags?
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> A selector is not not a variable or a function. CSS has functions (e.g translate) and it has variables, which are both distinct concepts in the language from selectors.
That misses the point. They're identifiers scoped to the entire document - the same way global variables and global functions are identifiers scoped to an entire program.
Because many web sites and apps aren't as simple as "my first homepage" and don't only consist of first-party code. Think component libraries. Reusable code. Content management systems. Third-party SDKs (chat widgets, support widgets, payment widgets like Stripe, etc.).
One of my earliest webdev jobs was at a company whose product was a widget you could add to your site by adding our `<script>` tag. Thus, our CSS needed to coexist with the first-party site's, not to mention any other third-party widgets on there. In other words: the same exact reason you need modules in traditional languages.