CSS

Here is a glossary of terms related to CSS (Cascading Style Sheets):

1. CSS: Cascading Style Sheets is a style sheet language used for describing the presentation and formatting of HTML and XML documents.

2. Selector: A selector is used to target HTML elements that you want to style. It specifies which elements the styles will be applied to.

3. Property: CSS properties define the visual appearance and behavior of HTML elements. Examples include `color`, `font-size`, `margin`, `padding`, and many more.

4. Value: Values are assigned to CSS properties and determine how the property will be applied. For example, `red` could be a value for the `color` property.

5. Declaration: A declaration consists of a CSS property and its corresponding value. Declarations are combined within curly braces `{ }` to form CSS rules.

6. Rule: A CSS rule consists of a selector and one or more declarations. It defines how selected elements should be styled. For example:
```css
selector {
  property: value;
}
```

7. Class: A class is a way to define a reusable set of styles that can be applied to multiple elements. It is denoted by a leading period (`.`) in CSS.

8. ID: An ID is used to uniquely identify a specific HTML element on a page. It is denoted by a leading hash (`#`) in CSS.

9. Pseudo-class: A pseudo-class is used to select elements based on specific states or conditions. Examples include `:hover`, `:active`, and `:nth-child()`.

10. Pseudo-element: A pseudo-element is used to style a specific part of an element. Examples include `::before` and `::after`, which create virtual elements.

11. Selector Specificity: Selector specificity determines which CSS rules take precedence when multiple rules target the same element. Specificity is based on the types of selectors used.

12. Box Model: The box model describes how elements are rendered on the web. It consists of the content area, padding, border, and margin.

13. Display Property: The `display` property determines how an element is rendered and behaves in the document flow. Common values include `block`, `inline`, and `flex`.

14. Float: The `float` property is used to position an element to the left or right of its container, allowing other content to flow around it.

15. Positioning: CSS positioning determines the layout and positioning of elements on a web page. Values include `static`, `relative`, `absolute`, and `fixed`.

16. Media Queries: Media queries allow styles to be applied selectively based on the characteristics of the user's device, such as screen size or orientation.

17. Flexbox: Flexbox is a CSS layout model that allows flexible and responsive positioning of elements within a container. It provides easy alignment and distribution of elements.

18. Grid: CSS Grid Layout is a powerful layout system that allows you to create two-dimensional grid-based layouts. It provides precise control over the placement and sizing of elements.

19. Transitions: CSS transitions enable smooth animations by specifying the transition of property values over time. They can be triggered by various events, such as hover or click.

20. Vendor Prefixes: Vendor prefixes are used to implement experimental or non-standard CSS properties. They are added before the property name and are specific to certain browsers, such as `-webkit-` for WebKit-based browsers.