What is CSS?
CSS stands for Cascading Style Sheets. It is a style sheet language that is used to describe the look and formatting of a document written in a markup language. It provides an additional feature to HTML. It is generally used with HTML to change the style of web pages and user interfaces. It can also be used with any kind of XML documents including plain XML, SVG, and XUL.
What does CSS do?
- You can add new looks to your old HTML documents.
- You can completely change the look of your website with only a few changes in CSS code.
Why use CSS?
These are the three major benefits of CSS:1) Solves a big problem
- Solves a big problem
- Saves a lot of time
- Provide more attributes
1) Solves a big problem
Before CSS, tags like font, color, background style, element alignments, border, and size had to be repeated on every web page. This was a very long process. For example: If you are developing a large website where fonts and color information are added on every single page, it will become a long and expensive process. It was created to solve this problem. It was a W3C recommendation.
2) Saves a lot of time
CSS style definitions are saved in external CSS files so it is possible to change the entire website by changing just one file.
3) Provide more attributes
It provides more detailed attributes than plain HTML to define the look and feel of the website.
Syntax of CSS
A CSS rule set contains a selector and a declaration block.
Selector: Selector indicates the HTML element you want to style. It could be any tag like <h1>, <title> etc.
Declaration Block: The declaration block can contain one or more declarations separated by a semicolon. For the above example, there are two declarations:
- color: yellow;
- font-size: 11 px;
Each declaration contains a property name and value, separated by a colon.
Property: A Property is a type of attribute of HTML element. It could be color, border etc.
Value: Values are assigned to CSS properties. In the above example, the value “yellow” is assigned to the color property.