What is div+css

div is the frame, css is the style, used to decorate the frame; to be more specific, div is to layout the entire web page, and css is responsible for controlling the style of the div. Wherever you want the div to be displayed, you can use css to achieve. And div css is a web page layout method, which refers to controlling the layout of divs through css.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

div is the frame, css is the style, used to decorate the frame. JS makes them move. To be more detailed, div is responsible for laying out the entire web page, and css is responsible for controlling the style of the div. You can use css to display the div wherever and how you want it to be. To put it simply, the layout of a web page is like building a house. The div is responsible for decorating the house. Cover it, and css is responsible for telling him how to cover it!

And DIV CSS is a WEB design standard. It is a web page layout method that controls the layout of divs through css. In fact, div here can be understood as a general term. In actual application, not only div, but also the positioning of any nodes such as p, span, img, table, etc. can be controlled through css.

Why use div css instead of

A long time ago, web engineers used tables to layout pages (now you can also find table layout applications in Google's picasa and other applications) (example), now the div css method is mostly recommended for page layout.

In WEB front-end development, the three troikas of HTML, CSS, and JS represent structure, display, and interaction respectively. In the era of web 1.0, the logic of the page is not particularly complicated, and the requirements for user experience are not very high. Tables are used by a large number of developers as layout elements, spanning the structure and display parts, and are very "heavy" of.

But now that web front-end logic is becoming more and more complex and user experience requirements are getting higher and higher, decoupling these three is necessary. At this time, it is not appropriate to use table for layout, because the language of the table tag is not used for layout at all, but for transmitting data. And div css is in line with the idea of ​​decoupling. div is used to control layout, and css is used to control style. From a small perspective, the benefit is that the code organization structure of the entire page is more reasonable and the degree of coupling is lower. From a large perspective, it is more conducive to in-depth division of labor and complex cooperation in front-end development.

A brief comparison:

1. div css is more flexible than table. Using table layout makes the code bloated.

2. Semantic issues. Semantically speaking, table should only be a container for tabular data, not a layout tool.

3. Style rendering problem. The table layout must wait until all content is loaded before rendering the style. If the user's Internet speed is not good, the user experience will be very poor.

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