What is CSS variable?

Custom properties (sometimes referred to as CSS variables or cascading variables) are entities defined by CSS authors that contain specific values to be reused throughout a document. Complex websites have very large amounts of CSS, often with a lot of repeated values.

What is a CSS value?

What are CSS values? CSS values are set against CSS Properties and reside within CSS declaration block, which is a part of the CSS rule / statement. CSS 2.1 allows following types of values : Integers and real numbers, Lengths, Percentages, URLs and URIs, Counters, Colors, Strings, Unsupported Values.

What is — mean in CSS?

Property names that are prefixed with — , like –example-name , represent custom properties that contain a value that can be used in other declarations using the var() function.

What are CSS properties?

A CSS rule consists of a CSS selector and a set of CSS properties. The CSS selector determines what HTML elements to target with the CSS rule. The CSS properties specifies what to style of the targeted HTML elements. CSS rules have to be specified inside either a style element or inside an external CSS file.

What are the three types of CSS?

There are three types of CSS which are given below:

• Inline CSS.
• Internal or Embedded CSS.
• External CSS.

How do you name variables in CSS?

To declare a variable in CSS, come up with a name for the variable, then append two hyphens (–) as the prefix. The element here refers to any valid HTML element that has access to this CSS file. The variable name is bg-color , and two hyphens are appended.

How can I use CSS variables in?

The var () function is used to insert the value of a CSS variable. CSS variables have access to the DOM, which means that you can create variables with local or global scope, change the variables with JavaScript, and change the variables based on media queries. A good way to use CSS variables is when it comes to the colors of your design.

What do you need to know about CSS variables?

CSS clutter.

Custom properties in a nutshell.

Custom property syntax.

The var () function.

Building values with calc () If you’ve never worked with it before,the calc () function is a handly little tool that lets you perform calculations to determine CSS values.

Working with custom properties in JavaScript.

Browser support.

Demo.

Further reading.

Can I define variables in CSS?

CSS variables|Valids/Invalids. When naming CSS variables,it contains only letters and dashes just like other CSS properties but it should start with double dashes ( — ).

Variable properties. Let’s look at each property more closely

a) Variable color.

b) Variable dimensions.

c) Variable cascading.

What is hierarchy in CSS?

The CSS hierarchy comprises various elements that you can define using the web components. Each element has a section that includes the name and description of the element, together with a table. You can use the name of the element to specify an element in a CSS rule.