Cascading Style Sheets

Before CSS, nearly all presentational attributes of HTML documents were contained within the HTML markup. All font colors, background styles, element alignments, borders, and sizes had to be explicitly described, often repeatedly, within the HTML. CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.

Someone who finds red italic headings difficult to read may apply a different style sheet. Browser extensions like Stylish and Stylus have been created to facilitate the management of such user style sheets. In the case of large projects, cascading can be used to determine which style has a higher priority when developers do integrate third-party styles that have conflicting priorities, and to further resolve those conflicts. Additionally, cascading can help create themed designs, which help designers fine-tune aspects of a design without compromising the overall layout.

#208: A CSS Grid Layout with Pictures Down One Side Matched Up with Paragraphs on the Other

CSS, or Cascading Style Sheets, offers a flexible way to style web content, with styles originating from browser defaults, user preferences, or web designers. These styles can be applied inline, within an HTML document, or through external .css files for broader consistency. Not only does this simplify web development by promoting reusability and maintainability, it also improves site performance because styles can be offloaded into dedicated .css files that browsers can cache. One of the goals of CSS is to allow users greater control over presentation.

Cascading Style Sheets (CSS) is a language that defines the presentation of a document. CSS can also be used with most markup languages, including XUL and SVG, and with practically any XML document that supports style sheets. CSS has been a fundamental part of the Web stack for the past couple of years, and like other technologies, it presents several security challenges.


At this point we’ve already looked at CSS fundamentals, how to style text, and how to style and manipulate the boxes that your content sits inside. Now it’s time to look at how to place your boxes in the right place in relation to the viewport, and to each other. Because I couldn’t be bothered what does cascading mean to figure out how they produced an effect I liked, I just linked to their code. I’m pretty sure that was completely legal, by the way, but I definitely don’t recommend you try it. It’ll only be a matter of time before they make some changes to their style sheet that breaks your site.

what are cascading style sheets

Nearly all browsers nowadays
support CSS and many other
applications do, too. To write CSS, you don’t need more than a
text editor, but there are many tools available that make it even easier. You can read more about file paths in the chapter HTML
File Paths. Our exhaustive CSS reference for seasoned Web developers describes every property and concept of CSS.

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