Why Used CSS Pseudo-class

A CSS (Cascading Style Sheets) selector is a pattern or rule used to select one or more HTML elements on a web page so that you can apply styles to them. CSS selectors are an essential part of web development as they allow you to control the presentation and layout of web content.
Selectors are used to target specific HTML elements based on various criteria, such as element type, class, ID, attributes, and their position within the HTML document’s structure. CSS selector is the first part of a CSS Rule. It is a pattern of elements and other terms that tell the browser which HTML elements should be selected to have the CSS property values inside the rule applied to them.
CSS selectors are used to define the elements you want to style with CSS. There are many different types of CSS selectors, each with their own unique syntax. These tell the browser which elements to apply CSS property values to.

How use Peseudo class in elements.

CSS Pseudo-class are used to target and style specific HTML elements on a web page. They serve several important purposes in web development:
CSS (Cascading Style Sheets) selectors are a fundamental part of web development, used to select and style HTML elements on a webpage. They allow you to target specific elements based on their attributes, tags, and relationships within the HTML structure. Here are some common CSS selectors and their uses

Styling: The primary purpose of CSS selectors is to apply styles to HTML elements. By using selectors, you can change the visual appearance of elements, such as their colors, fonts, sizes, spacing, and more. This allows you to create visually appealing and consistent designs for your website.

Layout Control: CSS selectors help control the layout of web pages. You can use selectors to position elements, set their dimensions, control spacing, and create responsive layouts that adapt to different screen sizes and devices.

Hierarchy and Specificity: CSS selectors allow you to specify which elements should receive particular styles. This is essential for maintaining a consistent design across a website with varying content. Selectors also provide a level of specificity, allowing you to override styles when necessary.

Accessibility: CSS selectors play a role in making websites more accessible. You can use them to provide better contrast, improve readability, and ensure that web content is usable by people with disabilities.

Maintenance and Consistency: By using Pseudo-class, you can apply styles consistently throughout your website. This makes it easier to update and maintain your site’s design. Changes made to a CSS rule are automatically reflected across all elements targeted by that rule.

Separation of Concerns: CSS promotes the separation of content (HTML) from presentation (CSS). By using selectors, you keep the styling separate from the HTML structure, making it easier to manage and collaborate on web projects. It also allows for reusability of styles across multiple pages.

Responsive Design: CSS selectors are crucial for creating responsive web designs. You can apply different styles to elements based on screen size or device type, ensuring that your website looks good and functions well on various platforms.

User Experience: CSS selectors contribute to a better user experience by helping you create visually pleasing and user-friendly interfaces. For example, you can use hover effects, transitions, and animations to enhance user interactions.

Cross-Browser Compatibility: CSS selectors are essential for ensuring that your website appears consistently across different web browsers. You can use CSS to handle browser-specific quirks and variations in rendering.

In summary, CSS selectors are a fundamental part of web development, enabling you to control the presentation, layout, and behavior of web content. They are crucial for creating well-designed, accessible, and responsive websites while promoting code maintainability and separation of concerns.

There are CSS Selectors.
:matches() (obsolete legacy selector alias for :is())

CSS pseudo-classes are used to select elements based on their states or properties. Some of the pseudo-classes you’ve listed are not standard CSS pseudo-classes, and some may have limited browser support. However, I’ll provide examples for several commonly used CSS pseudo-classes to demonstrate how they can be used:

:active: This pseudo-class selects an element when it is being activated, typically when a user clicks on it. Here’s an example:

a:active {
  color: red;
This CSS rule changes the text color of links to red when they are clicked.

:hover: This pseudo-class selects an element when a user hovers their mouse pointer over it. Example:

button:hover {
  background-color: #3498db;
:focus: Selects an element when it receives keyboard focus or is clicked. Useful for styling form inputs:

input:focus {
  border-color: green;
This CSS rule changes the border color of an input field when it is focused.

:first-child: Selects the first child element of its parent. Example:

li:first-child {
  font-weight: bold;
This CSS rule makes the first list item in an ordered or unordered list bold.

:last-child: Selects the last child element of its parent. Example:

div p:last-child {
  color: purple;

This CSS rule changes the text color of the last paragraph inside a <div> element to purple.

:nth-child(): Selects elements based on their position within their parent element. You can specify a formula to target specific elements. Example:

ul li:nth-child(odd) {
  background-color: #f2f2f2;

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