What is the impossible function of css style sheet?

With the continuous advancement of computer technology and the widespread use of the Internet, web design has become an indispensable part of society's daily life. As one of the indispensable components in web design, CSS style sheets play an important role. CSS style sheet is a style sheet language based on markup language. It can be used to control the style of web pages, including fonts, colors, layout, etc. However, although CSS style sheets are powerful, they are not omnipotent, and some functions cannot be achieved through CSS anyway. Let's take a look at what functions CSS style sheets cannot achieve.

1. Dynamic effects

In web design, dynamic effects are very important. They can add more vividness and interactivity to the web page. However, CSS style sheets cannot achieve complex dynamic effects, such as changes in pictures when the mouse is hovered, scrolling effects on web pages, video playback, audio playback, and a series of other dynamic effects that cannot be achieved through CSS. These effects need to be achieved with the help of other programming languages ​​such as JavaScript.

2. Paging effect

In some web applications, data needs to be displayed in pages. For example, an article may have many pages, and a paging navigation needs to be added between these pages for users to easily turn pages. However, CSS stylesheets cannot achieve this paging effect. Although CSS can perform paging through the page-break style, this is only effective when printing and does not apply to the paging function implemented on web pages.

3. Form verification

In web design, forms play a very important role. For example, registration, login, comment and other related operations need to be completed through forms. However, CSS stylesheets cannot do form validation. Form verification needs to be implemented using JavaScript and other programming languages, such as verifying whether the mobile phone number entered by the user is correct, whether the email address is correct, whether the user name and password have been entered, etc.

4. Image processing

Although the CSS style sheet can control the size, position, border and other styles of images in web pages, it cannot perform image processing, such as cropping, rotating, and scaling of images. etc. These image processing need to be implemented using graphics processing software or other programming languages.

5. Data interaction

CSS style sheets cannot realize data interaction. For example, when shopping online, users need to submit the product name, quantity, price and other data in their shopping cart to the server for processing, and then the server returns the corresponding results. This data interaction requires the use of back-end programming languages ​​and database technologies.

To sum up, although CSS style sheet is an important part of web design, it is not omnipotent, and some functions cannot be achieved through CSS anyway. When designing web pages, you need to choose appropriate technologies or tools to use according to specific needs in order to create more vivid, interesting and practical web page effects.

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