20 Facts About CSS 3

CSS 3 is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript.

CSS 3 is designed to enable the separation of presentation and content, including layout, colors, and fonts.

CSS 3 has rules for alternate formatting if the content is accessed on a mobile device.

CSS 3 specifications are maintained by the World Wide Web Consortium .

CSS 3 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 3, selectors declare which part of the markup a style applies to by matching tags and attributes in the markup itself.

CSS 3 lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.

CSS 3 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 3 defines non-visual styles, such as reading speed and emphasis for aural text readers.

One of the goals of CSS 3 is to allow users greater control over presentation.

Inheritance is a key feature in CSS 3; it relies on the ancestor-descendant relationship to operate.

Inheritance in CSS 3 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 3 was first proposed by Hakon Wium Lie on 10 October 1994.

In 2005, the CSS 3 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 3, they were still incorrect in certain areas and were fraught with inconsistencies, bugs and other quirks.

CSS 3 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 3 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 3 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 3 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.