What is the element box model

The element box model is an important concept in CSS, used to describe and control the layout and size of HTML elements. It refers to the space occupied by HTML elements when they are rendered on the page, including the content and content of the elements. Margins, borders and margins. Detailed introduction: 1. The content area is the area where the element displays the actual content, such as text, image or other nested elements. Its size is determined by the width and height attributes of the element; 2. Padding, the padding is the content of the element and The space between borders, which can be controlled via padding properties and more.

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

The element box model (Box Model) is an important concept in CSS, used to describe and control the layout and size of HTML elements. It refers to the space occupied by HTML elements when they are rendered on the page, including the element's content, padding, borders, and margins.

The element box model consists of four main parts: content area (content), padding (padding), border (border) and outer margin (margin). Each section has its own properties and values, which can be controlled through CSS styles.

1. Content area (content): The content area is the area where the element displays the actual content, such as text, images, or other nested elements. Its size is determined by the element's width and height properties.

2. Padding: Padding is the space between the element content and the border. It can be controlled through the padding attribute. You can set the padding values ​​in the top, right, bottom, and left directions respectively, or you can use the abbreviation to set a unified padding value.

3. Border: The border is the line or style surrounding the content and padding of the element. It can be set through the border attribute, including the width, style and color of the border. Similarly, you can set the border attributes in the four directions of top, right, bottom, and left respectively, or you can use abbreviations to set unified border attributes.

4. Margin: Margin is the space between an element and other elements. It can be set through the margin attribute. You can set the margin values ​​in the top, right, bottom, and left directions respectively, or you can use the abbreviation to set a unified margin value.

The size of the element box model is calculated by adding the content area, padding, borders, and margins. For example, if an element has a width of 200px, a padding of 20px, a border of 2px, and a margin of 10px, the total width it occupies on the page will be 200px 20px 2px 10px = 232px.

The flexibility of the element box model allows developers to have better control over the layout and style of elements. By adjusting the element's box model properties, you can change the element's size, spacing, and border style to achieve various layout effects.

To summarize, the element box model is an important concept in CSS, used to describe and control the layout and size of HTML elements. It consists of content area, padding, border and margin. By adjusting the values ​​of these properties, various layout effects can be achieved. It is very important for developers to understand and master the concept and usage of the element box model.

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