What values ​​does Position have?

The values ​​of position include static, relative, absolute, fixed, etc. Detailed introduction: 1. static static positioning is the default value of the position attribute, which means that if the position attribute is not set, the element will default to static positioning. Static positioning elements will not be specially positioned. They are arranged in the order of the document flow. Its elements are not affected by the top, right, bottom and left attributes; 2. relative positioning, etc.

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

As a front-end programmer, it is very important to understand and be familiar with the position attribute of CSS. The position attribute is used to define how an element is positioned in the document. In CSS, the position attribute has four main values: static, relative, absolute and fixed. Each value has different positioning methods and characteristics. The meaning and usage of each value will be introduced in detail below.

1. static (static positioning):

Static positioning is the default value of the position attribute, which means that if the position attribute is not set, the element will default to static positioning. Static positioned elements are not specifically positioned, they are arranged in the order of the document flow. Static positioned elements are not affected by the top, right, bottom and left attributes.

2. Relative (relative positioning):

Relative positioning is relative to the original position of the element in the document flow. Relatively positioned elements can adjust their position by setting the top, right, bottom, and left attributes. A relatively positioned element still occupies the original space and other elements will not fill its position. If the top, right, bottom, and left attributes are not set, relatively positioned elements will remain in their original positions.

3. Absolute (absolute positioning):

Absolute positioning is positioned relative to the nearest positioned ancestor element. If there is no positioned ancestor element, it is positioned relative to the initial containing block of the document. To position. Absolutely positioned elements are removed from the document flow and do not occupy the original space. Absolutely positioned elements can adjust their position by setting the top, right, bottom, and left attributes. Absolutely positioned elements can cover other elements, and their position in the stacking order can be controlled through the z-index attribute.

4. fixed (fixed positioning):

Fixed positioning is positioned relative to the browser window. Fixed-positioned elements are removed from the document flow and do not occupy their original space. Fixed-positioned elements can adjust their position by setting the top, right, bottom, and left attributes. Fixed-positioned elements always remain in a fixed position in the browser window and do not change their position even when the page is scrolled. Fixed-positioned elements can cover other elements, and their position in the stacking order can be controlled through the z-index attribute.

Summary:

In front-end development, it is very important to understand and be familiar with the position attribute of CSS. By rationally using the position attribute, we can achieve various layout effects and positioning methods. Static positioning, relative positioning, absolute positioning and fixed positioning are suitable for different scenarios and needs. Mastering the characteristics and usage of these positioning methods can help us better implement page layout and element positioning, and improve user experience and interface effects. As front-end programmers, we should have a deep understanding of these positioning methods and flexibly apply them in actual projects.

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