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::before pseudo-element

Defines generated content that functions as a virtual first-child of the matched element.

CSS 2.1, Section 5.12.3

Syntax

sel::before {...}

Parameters

sel

A simple selector.

Standards information

Remarks

The ::before and ::after pseudo-elements create virtual first and last children within an element in the document tree. The content attribute, in conjunction with these pseudo-elements, specifies what is inserted. Other specified styling properties apply to the appearance of the inserted content, not to the element's content.

The generated content interacts with other boxes as if they were real elements inserted just inside their associated element. The content box of the associated element expands to include the generated content, if necessary.

Examples

The following style rules insert curly braces before and after each occurrence of h1 in the document tree. The curly braces will be displayed in brown on a light blue background; the element itself will remain unchanged.


h1::before {
  content: "{ ";
  color: brown;
  background: lightblue;
}
h1::after {
  content: " }";
  color: brown;
  background: lightblue;
}

In the image below, you can see the curly braces before and after the h1.

An h1 element with curly braces surrounding it


<body>
   <h1>Lorem ipsum dolor sit amet</h1>
</body>

See also

content

 

 

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