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CSS, or Cascading Style Sheets, are an important part of web design and

frontend development.

CSS provides the presentation layer that can turn unexciting HTML into a beautiful,

vibrant webpage.

There are lots of concepts and techniques to learn to master CSS.

But to get started as a full stack JavaScript developer,

you'll need a basic understanding of CSS and a deeper knowledge of CSS selectors.

I'm Guil, a JavaScript and frontend web development teacher here at Treehouse.

In this course I'll teach you what you need to know and understand about CSS

selectors to begin writing JavaScript programs that make webpages interactive.

Having a deep knowledge of CSS selectors is incredibly for JavaScript

developers writing code that works with the DOM, or Document Object Model.

The DOM is what allows JavaScript to interact with and

make changes to elements on a webpage.

You'll learn a whole lot more about working with JavaScript and

the DOM in another course.

Coming up in this course,

we'll start by reviewing the common ways to define a CSS selector.

For instance, selectors can be defined based on an element's type, ID,

class or any of its attributes and values.

You'll then learn how to use psuedo-classes to select elements based on

user interaction and combinators that target elements based on their position

and relation to other elements in the DOM.

And we'll go over CSS selector strategies and best practices for

working with JavaScript.

This course is mostly made up of text-based steps to let you

progress at your own pace.

You're also going to get plenty of practice opportunities along the way with

code challenges.

If you have questions about anything covered in this course,

feel free to reach out to the Treehouse staff or other students in the community.

Let's get to it.