What does the standard box model include?

The standard box model includes content area, border, padding and margins, etc. Detailed introduction: 1. The content area is the area where the element actually displays content. Its size is determined by the width and height attributes of the element; 2. The border is a line surrounding the outside of the content area to separate the content of the element from other elements. The size of the border is determined by the border-width attribute; 3. The padding is the space between the content area and the border, which is used to control the distance between the element content and the border. The size of the padding is determined by the padding attribute, etc.

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

The standard box model is a model used in CSS to describe and layout HTML elements. It defines the space occupied by an element in a web page and determines the element's dimensions, borders, padding, and margins. The standard box model includes the following parts:

1. Content area: The content area is the area where the element actually displays content. Its size is determined by the element's width and height attributes.

2. Border: The border is a line around the outside of the content area to separate the content of the element from other elements. The size of the border is determined by the border-width property.

3. Padding: Padding is the space between the content area and the border, which is used to control the distance between the element content and the border. The size of the padding is determined by the padding attribute.

4. Margin: Margin is the space between an element and other elements, used to control the distance between an element and other elements. The size of the margin is determined by the margin attribute.

The characteristic of the standard box model is that the size of the element (including width and height) refers to the size of the content area, excluding borders, padding and margins. This means that if you set a width of 100px for an element, the actual displayed width will be 100px plus the size of the border, padding, and margins.

In the standard box model, the size of elements can be determined by calculation. For example, if an element has a width of 200px, a border of 2px, a padding of 10px, and a margin of 20px, the actual displayed width will be 200px 2px 10px 20px = 232px.

Another characteristic of the standard box model is that the border and padding of an element will occupy the space of the element, that is, they will increase the size of the element. This can cause problems when elements are laid out, especially when there are borders and padding between them. To solve this problem, CSS introduced another box model, called the IE box model or the weird box model, which includes the size of the border and padding in the dimensions of the element.

To sum up, the standard box model includes content area, border, padding and margins. It defines the space that an element occupies on a web page, and determines its dimensions, borders, padding, and margins. Understanding and mastering the standard box model is very important for correctly laying out and designing web pages

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