Pseudo-element
CSS Pseudo-element
A keyword targeting a specific part of an element (e.g. ::before, ::after, ::first-line, ::selection).
Technical Detail
CSS pseudo-element is part of the CSS specification maintained by the W3C CSS Working Group. Browser rendering engines (Blink, WebKit, Gecko) implement the specification through their layout and paint pipeline stages. Understanding the rendering pipeline — Style → Layout → Paint → Composite — is key to writing performant CSS. Properties that trigger layout recalculation (width, height, margin) are more expensive than those that only trigger compositing (transform, opacity).
Example
```css
/* Example: Pseudo-element */
.element {
/* Apply pseudo element to this element */
display: block;
margin: 0 auto;
}
```
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