FAQ: Learn CSS Selectors Visual Rules - CSS Setup Selectors - Intro to CSS

This community-built FAQ covers the “Intro to CSS” exercise in Codecademy’s CSS lessons.

FAQs on the CSS exercise Intro to CSS

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How does CSS know which HTML to style? I couldn’t find anything mentioning index.html in style.css.

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In this example each section was assigned two classes, one common “container” and one unique name. For the unique names (ie. nav, header, jumbotron) why weren’t id’s used instead of classes?

Why have <div> elements been used with class attributes specifying their function i.e. header and nav? Rather than the semantic markup i.e. <header> and <nav>?

Is it because of something CSS related? I previously read that semantic HTML is better for accessibility and machine readability, than using <div>s with classes…

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I’m not an experto, but if I were to withdraw some clue from what I’ve learned so far I would say that the linking, or better said the reference is unidirectional. If you notice on some html file samples, the < head > has a with rel= and href= attributes, which tells me it is referencing the code there. As a resource, CSS serves the HTML but not the other way.

Again I apologize if this is wrong or vague, I’m just trying to apply what I’ve learned so far… anyway, enough of self-deprecation!!! :grimacing: hope this brings some experts attention! @wiki-bot

Ciao!

p.s.: found this helpful article later on https://discuss.codecademy.com/t/how-do-i-link-my-html-and-css/423288