CSS Selector

A CSS Selector is a pattern used in CSS (Cascading Style Sheets) to select and style HTML elements. Selectors allow developers to target specific elements on a web page and apply styles to them, enabling precise control over the look and feel of the website.

Key Features of CSS Selectors

1. Element Selector: Targets all instances of a specified HTML element.
2. Example: p selects all

   elements.

3. Class Selector: Targets elements with a specified class attribute.
4. Example: .classname selects all elements with class="classname".
5. ID Selector: Targets a single element with a specified ID attribute.
6. Example: #idname selects the element with id="idname".
7. Attribute Selector: Targets elements with a specified attribute.
8. Example: [type="text"] selects all input elements with type="text".
9. Pseudo-class Selector: Targets elements in a specific state.
10. Example: a:hover selects links when they are hovered over.
11. Pseudo-element Selector: Targets parts of elements.
12. Example: p::first-line selects the first line of all

    elements.

Use Cases

• Web Design: Applying consistent styles to headings, paragraphs, buttons, and other elements.

• Responsive Design: Targeting elements based on device type or screen size.

• Interactive Elements: Styling elements based on user interactions, such as hovering or clicking.

• Theming: Applying different themes by switching class names or attribute values.

Common Combinators

• Descendant Combinator: div p selects all

  elements inside

  elements.

• Child Combinator: div > p selects all

  elements that are direct children of

  elements.

• Adjacent Sibling Combinator: h1 + p selects the

  element immediately following an

  element.

• General Sibling Combinator: h1 ~ p selects all

  elements that are siblings of an

  element.

Overall, CSS Selectors are fundamental tools in web development, providing the means to apply styles efficiently and effectively, enhancing the visual and interactive experience of web pages.