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This course contains a high-level overview of Cascading Style Sheets, while exploring the basic concepts, terminology, and tools of the language. Beginning with an exploration of CSS syntax, author James Williamson explains how CSS modifies text, borders, backgrounds, and color; demonstrates CSS and HTML integration; and contextualizes the current state of CSS. The course also tours some of the most popular CSS editors and frameworks and lists online tools and resources for further study. This course is for people who want a big-picture overview before taking hands-on courses.
If you're brand-new to web design it's often easy to get overwhelmed at all the different technologies and terminology used in web development. Trying to understand what you need to learn first, or even making sense of it all, can be frustrating. With that in mind, I want to take a moment to define exactly what CSS is and where it fits in a larger scheme of web design. CSS, or Cascading Style Sheets, is a style sheet language developed to control the presentation of markup language documents, like HTML. You can think of HTML as controlling the structure of the web while CSS controls the presentation of it.
This means that CSS consists of a collection of formatting rules which identify the elements in the document that they should control and the properties that they wish to set. These styles are usually contained in an external file that can control a single document or entire web site. The term cascade refers to how these styles are applied to pages. Styles are applied in the order that they're found and since styles can be placed in several different locations, this often results in a cascade of styles, from external documents all the way down to locally placed styles.
Now in some cases a web site might use all of these elements, while in others it might only use HTML and CSS. This modular approach means that you can change each of these elements independently of each other. In terms of CSS, you can change the entire layout and design of a page without ever changing its content or structure. You also speed development and site maintenance by controlling the formatting for an entire site through a small number of CSS files. Separating style and structure in this way helps your content become more portable as well.
You can define separate styles for different types of media so that your page looks one way on the desktop and receives a more optimized design for print and mobile devices. As more and more devices consume web content, this allows you to control the presentation of your content within that device without having to change the structure of your file. Regardless of how complex the site is, I think it's pretty easy to see how important CSS is to the overall process of creating web sites. Anyone wanting to learn web design should regard CSS as an essential skill.
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