What is css cascading

css cascading refers to how the browser decides which rule will be applied to the element when multiple CSS rules are applied to the same element at the same time in an HTML document, and how to handle conflicts between rules. The CSS cascading mechanism works based on a series of rules and priorities that determine which styles will be applied to elements and which style will take precedence when multiple styles conflict. The order of rules is browser default style, external style sheet, internal style sheet, and inline style.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

CSS cascading is one of the very important concepts in front-end development. It refers to how the browser decides which rule will be applied to the element in an HTML document when multiple CSS rules are applied to the same element at the same time, and how to handle conflicts between rules.

The CSS cascading mechanism works based on a series of rules and priorities. These rules and priorities determine which styles will be applied to elements, and which style will take precedence when multiple styles conflict. Below we will introduce the rules and priorities of CSS cascading in detail.

First of all, CSS cascading rules are processed in a specific order. The order is:

1. Browser default styles: The browser will define some default styles for each HTML element. These styles are usually defined by browser manufacturers to ensure that the page can display normally without CSS styles.

2. External style sheet: External style sheet is a method that defines CSS styles in a separate file and then references them in the HTML document. When a browser parses an HTML document, it first loads the external style sheet and applies the styles from it.

3. Internal style sheet: Internal style sheet is a method of defining CSS styles in the `