Code:
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What is CSS?
Cascading Style Sheets allows you to create great-looking web pages, but how does it work under the hood? This article explains what CSS is with a simple syntax example and also covers some key terms about the language.
However, the web would be a boring place if all websites looked like that. Using CSS, you can control exactly how HTML elements look in the browser, presenting your markup using whatever design you like.
What is CSS for?
As we have mentioned before, CSS is a language for specifying how documents are presented to users — how they are styled, laid out, etc.
A document is usually a text file structured using a markup language — HTML is the most common markup language, but you may also come across other markup languages such as SVG or XML.
Presenting a document to a user means converting it into a form usable by your audience. Browsers, like Firefox, Chrome, or Edge , are designed to present documents visually, for example, on a computer screen, projector, or printer.
CSS syntax
CSS is a rule-based language — you define the rules by specifying groups of styles that should be applied to particular elements or groups of elements on your web page.
For example, you can decide to have the main heading on your page to be shown as large red text. The following code shows a very simple CSS rule that would achieve the styling described above:
In the above example, the CSS rule opens with a selector . This selects the HTML element that we are going to style. In this case, we are styling level one headings (<h1>).
We then have a set of curly braces { }.
Inside the braces will be one or more declarations, which take the form of property and value pairs. We specify the property (color in the above example) before the colon, and we specify the value of the property after the colon (red in this example).
This example contains two declarations, one for color and the other for font-size. Each pair specifies a property of the element(s) we are selecting (<h1> in this case), then a value that we'd like to give the property.
CSS properties have different allowable values, depending on which property is being specified. In our example, we have the color property, which can take various color values. We also have the font-size property. This property can take various size units as a value.
When do you use
Often when writing CSS Style Sheets your indentation, spacing, and other formatting can become a bit disorganized. It is also common for multiple developers to work on a single project who have different formatting techniques. This tool is helpful for making the formatting of a file consistent. It is also common for CSS Style Sheets to be minified or obfuscated. You can use this tool to make that code look pretty and readable so it is easier to edit.
