DEFINITION OF CSS

The acronym CSS corresponds to the English expression Cascading StyleSheets, which can be translated as “Cascading Style Sheets”. The concept is used in the field of computing to refer to a language used in graphic design.

The CSS language allows to present, in a structured way, a document that was written in a markup language. It is especially used in the visual design of a website when the pages are written in XML or HTML.

You have to go back to the 90s to know the origin of CSS. And it is that it was in 1994 when it was proposed by Hakon Wium Lie. This was co-creator of that with the Dutch scientist Bert Bos.

CSS was developed at different levels. CCS1 is no longer used, while CSS2 works as a recommendation. CSS3, which is divided into several modules, is the language that is being taken as a standard.

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About CSS3 we can establish that there are about 50 published modules, although among the most important are Namespaces, Selectors and Color.

What CSS does is take care of the description of the forms and the syntax of the markup language. In this way it describes how the elements that appear on the screen have to be rendered (generated the images).

The CSS design makes it possible to establish a separation between the content and the form of presentation of the document (given by the fonts, colors and layers used). This allows many HTML documents to share the same look and feel, using a single style sheet for all (which is specified in a.css file ). Thanks to this feature, you avoid having to repeat the code in the structure.

Thanks to the separation of the content and the form of presentation, on the other hand, different styles can be used according to the rendering method: if it is a document displayed on a screen, printed, shared in audio format, etc.

In addition to all of the above, we can emphasize that thanks to CSS, web pages can be created with a design that can be attractive and pleasant. Of course, to be able to use it, it is essential to have basic knowledge of it as well as computer science, the HTML language and even certain skills and ideas regarding file management.

In the same way, it must be taken into account that what is known as DOM plays an essential role in this regard. Under these acronyms is what is called Model Document Object, which is how a document is represented in the memory of a computer. Moreover, we can establish, therefore, that the browser is responsible for displaying the content of the aforementioned DOM.

Likewise, we have to take into account that this document has a tree structure and that each of its elements (section, attribute…) are renamed with the term node. Hence, in the aforementioned structure we come across sibling nodes or child nodes, for example.

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