c_css">
<p>CSS (Cascading Style Sheets) are used to style HTML. While HTML lays out the
basic structure, CSS provides the rules for how that structure should display in
the browser.</p>
<p>If you're new to CSS, we recommend <a href="https://developer.mozilla.org/en-US/docs/Learn/CSS/First_steps">the MDN guide for learning it</a>,
as it is fairly comprehensive and up to date.</p>
</section>
<h2 id="toc_javascript">JavaScript <a href="#toc_javascript"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 5