Element: pseudo() method

Syntax

pseudo(type)

Parameters

type

A string representing the type of pseudo-element to return a representation of. Valid values are:

• ::after
• ::before
• ::marker

Return value

A CSSPseudoElement object instance, or null if type is not equal to a valid pseudo-element type.

Examples

Basic usage

In this example, we demonstrate basic usage of the pseudo() method.

HTML

We include a <p> element containing text, and an <output> element to log output from JavaScript.

<p>New York's hottest club is...</p>
<output></output>

CSS

We give the <p> element's ::after pseudo-element some content and apply some basic styles to both.

body {
  width: 80%;
  margin: 0 auto;
}

p {
  background-color: violet;
  padding: 20px;
}

p::after {
  content: "Crease";
  background-color: cadetblue;
  padding: 20px;
}

JavaScript

In our script, we grab references to our <p> and <output> elements, and retrieve a CSSPseudoElement representing the <p> element's ::after pseudo-element via the pseudo() method. We then log some details of the pseudo-element to our <output> element. We also include some rudimentary error handling via a try...catch structure, to print an error message in non-supporting browsers.

const pElem = document.querySelector("p");
const output = document.querySelector("output");

try {
  const pseudoElem = pElem.pseudo("::after");
  output.textContent = `${pseudoElem.type} pseudo-element. Parent: <${pseudoElem.parent.tagName.toLowerCase()}>`;
} catch (e) {
  output.textContent = `Your browser doesn't support CSSPseudoElement and/or the pseudo() method: ${e}`;
}

Result

Specifications

Browser compatibility

See also

• CSSPseudoElement.pseudo()