CSS3 selectors are patterns used to select and style HTML elements. They are a crucial part of CSS (Cascading Style Sheets) and are used to apply styles to specific elements on a webpage. CSS3 introduced several new selectors, building upon the selectors available in previous versions of CSS. Here's an overview of some of the CSS3 selectors:
1. *Universal Selector (`*`):*
Selects all elements on the page.
2. *Type Selector (Element Selector):*
Selects all instances of a specified HTML element.
Example: `p` selects all `p` elements.
3. *Class Selector (`.`):*
Selects all elements with a specific class attribute.
Example: `.example` selects all elements with `class="example"`.
4. *ID Selector (`#`):*
Selects a single element with a specific id attribute.
Example: `#header` selects the element with `id="header"`.
5. *Attribute Selector (`[]`):*
Selects elements based on the presence or value of their attributes.
Example: `[type="text"]` selects all elements with `type="text"`.
6. *Descendant Selector (` `):*
Selects all elements that are descendants of a specified element.
Example: `div p` selects all `p` elements that are descendants of a `div`.
7. *Child Selector (``):*
Selects all direct children of a specified element.
Example: `ul li` selects all `li` elements that are direct children of a `ul`.
8. *Adjacent Sibling Selector (`+`):*
Selects an element that is immediately preceded by a specified element.
Example: `h2 + p` selects the `p` element that directly follows an `h2`.
9. *General Sibling Selector (`~`):*
Selects all siblings of a specified element.
Example: `h2 ~ p` selects all `p` elements that are siblings of an `h2`.
10. *Pseudo-classes and Pseudo-elements:*
Pseudo-classes select elements based on their state or position, like `:hover` or `:nth-child`.
Pseudo-elements select parts of an element, such as `::before` or `::after`.
11. *Attribute Selectors with Substring Matching:*
CSS3 introduces attribute selectors that match substrings, such as `^` (prefix), `$` (suffix), and `*` (substring).
These selectors allow for fine-grained control over styling, making it possible to target specific elements or groups of elements on a webpage. Understanding and using these selectors effectively can greatly enhance your ability to style and design web pages.
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