What is css elastic layout

CSS elastic layout is a modern web page layout technology that creates flexible and adaptive web page layouts by using CSS properties and values. The Flexbox model is a layout model introduced in CSS3 and is designed to Simplify and improve the arrangement and alignment of web page elements. CSS elastic layout has the advantages of flexible layout, adaptability, simplified nested structure, responsive design, scalability and maintainability. Through CSS elastic layout, flexible, adaptive, and responsive web page layout can be achieved to provide a better user experience.

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

CSS Flexbox (CSS Flexbox) is a modern web page layout technology that uses CSS properties and values ​​to create flexible and adaptive web page layouts. The Flexbox model is a layout model introduced in CSS3 that aims to simplify and improve the arrangement and alignment of web page elements.

CSS elastic layout enables web page elements to automatically adjust size, position, and order to adapt to different screen sizes and devices by defining the relationship between the container and its internal elements. The core idea of ​​flexible layout is to divide the container into two directions: the main axis and the cross axis, and control the layout of the elements on the main axis and the cross axis by setting the properties of the container and elements.

In CSS flexible layout, it mainly involves the following concepts and attributes:

1. Flex Container: The flexible container is the parent element that applies flexible layout. By setting the display attribute Create a flex container for "flex" or "inline-flex". The child elements of a flex container are called Flex Items.

2. Main Axis (Main Axis) and Cross Axis (Cross Axis): The main axis in a flexible container is the main direction in which flexible items are arranged, which can be horizontal (row) or vertical (column). The cross axis is the direction perpendicular to the main axis.

3. Flex Item: The child elements in the flexible container are called flexible items. Flex items can be laid out and aligned based on the properties of the flex container. Each flex item has its own size and location.

4. Main Axis Alignment: Control the alignment of flexible items on the main axis by setting the justify-content property of the container, such as flex-start (starting point alignment), flex-end (end point alignment) ), center (center alignment), space-between (align both ends, equal spacing between items), space-around (equal spacing on both sides of each item), etc.

5. Cross Axis Alignment: Control the alignment of flexible items on the cross axis by setting the align-items property of the container, such as flex-start (starting point alignment), flex-end ( End point alignment), center (center alignment), baseline (baseline alignment), stretch (stretch alignment), etc.

6. Flex Sizing: Control the scaling ratio of the elastic item on the main axis by setting the flex property of the elastic item. The flex attribute consists of three values, which respectively represent the scaling ratio, elastic base value and minimum width.

The advantages and functions of CSS elastic layout include:

1. Flexible layout method: CSS elastic layout provides a flexible layout method, allowing web page elements to automatically adjust their size, position, and order. to adapt to different screen sizes and devices. By simply setting the properties of containers and elements, we can easily achieve complex web page layout effects.

2. Adaptability: CSS flexible layout allows web pages to automatically adapt to different screen sizes and devices. By setting the properties of containers and elements, we can achieve adaptive web page layout. This means that web pages can be rendered optimally on different devices without the need to create separate versions of the web page for each device.

3. Simplify the nested structure: CSS flexible layout can reduce the nested structure and simplify the HTML code. By setting the properties of containers and elements, we can easily achieve common layout effects such as multi-column layout, vertical centering, and horizontal centering, without using complex CSS techniques and additional HTML structures.

4. Responsive design: CSS elastic layout is very suitable for responsive design, which can automatically adjust the layout according to different screen sizes and devices. By setting the properties of containers and elements, we can achieve responsive design effects such as fluid layout, adaptive navigation, and elastic images, providing a consistent user experience.

5. Scalability and maintainability: CSS elastic layout has good scalability and maintainability. By using CSS elastic layout, we can divide the web page into multiple modules and add, delete and adjust them as needed. In this way, we can develop and maintain web pages more flexibly and improve the readability and maintainability of the code.

In general, CSS elastic layout is a modern web page layout technology that allows web page elements to automatically adjust their size, position, and order to adapt to different screen sizes by setting the properties of containers and elements. and equipment. CSS elastic layout has the advantages of flexible layout, adaptability, simplified nested structure, responsive design, scalability and maintainability. Through CSS elastic layout, we can achieve flexible, adaptive, and responsive web page layout and provide a better user experience.

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