20 Facts About CSS

CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.

CSS is designed to enable the separation of presentation and content, including layout, colors, and fonts.

CSS has rules for alternate formatting if the content is accessed on a mobile device.

CSS specifications are maintained by the World Wide Web Consortium .

CSS has a simple syntax and uses a number of English keywords to specify the names of various style properties.

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In CSS, selectors declare which part of the markup a style applies to by matching tags and attributes in the markup itself.

CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.

CSS can define color, font, text alignment, size, borders, spacing, layout and many other typographic characteristics, and can do so independently for on-screen and printed views.

CSS defines non-visual styles, such as reading speed and emphasis for aural text readers.

One of the goals of CSS is to allow users greater control over presentation.

Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate.

Inheritance in CSS is not the same as inheritance in class-based programming languages, where it is possible to define class B as "like class A, but with modifications".

CSS was first proposed by Hakon Wium Lie on 10 October 1994.

In 2005, the CSS Working Groups decided to enforce the requirements for standards more strictly.

However, even when later "version 5" web browsers began to offer a fairly full implementation of CSS, they were still incorrect in certain areas and were fraught with inconsistencies, bugs and other quirks.

CSS Working Group sometimes publishes "Snapshots", a collection of whole modules and parts of other drafts that are considered stable enough to be implemented by browser developers.

Adoption of new functionality in CSS can be hindered by lack of support in major browsers.

Additionally, the CSS 3 defines feature queries, which provide an @supports directive that will allow developers to target browsers with support for certain functionality directly within their CSS.

CSS that is not supported by older browsers can sometimes be patched in using JavaScript polyfills, which are pieces of JavaScript code designed to make browsers behave consistently.

CSS frameworks are pre-prepared libraries that are meant to allow for easier, more standards-compliant styling of web pages using the Cascading Style Sheets language.