Master the definition and function of fixed positioning, and understand the meaning and use of fixed positioning

Fixed positioning is a CSS layout technology that is used to fix elements at a certain position on the page, regardless of page scrolling. In fixed positioning, an element's position is positioned relative to the viewport rather than other elements.

The definition and function of fixed positioning
The definition of fixed positioning refers to fixing an element at a certain position on the page and not moving as the page scrolls. When using fixed positioning, the element's position is positioned relative to the browser's viewport. Mainly used to create navigation bars, toolbars and other elements that need to be fixed on the screen.

The role of fixed positioning includes the following aspects:

1. Create floating elements: By using fixed positioning, you can easily create floating elements to float at a certain location on the page. . This is very useful for creating page elements such as navigation menus and advertising floating windows.
2. Improve user experience: Fixed positioning can provide a better user experience, especially when browsing the web on mobile devices. For example, when browsing the web, the website's navigation menu can be kept at the top of the page using fixed positioning, allowing users to navigate at any time without having to scroll up the page.
3. Increase content display space: By placing fixed elements on the edges or corners of the page, you can make full use of the page space and display more content. This is very effective for web pages that need to display more information, such as news pages, blog pages, etc.
4. Increase interactivity: Fixed positioning can make web page elements more interactive. For example, in a web page, you can use fixed positioning to create a "back to top" button. When the user scrolls down the page, the button will be fixed at a certain position on the screen, allowing the user to return to the top of the page with one click.
5. Improve brand image: Certain elements fixed on the page, such as the company's logo, contact information and other information, can help brand building and promotion. With fixed positioning, these elements can always be present on the page, allowing users to see and remember the brand at all times.

Summary
Fixed positioning is a CSS layout technology that can fix an element to a certain position on the page and is not affected by page scrolling. Through fixed positioning, you can create floating elements, improve user experience, increase content display space, increase interactivity, and improve brand image, etc. When using fixed positioning, you need to pay attention to the positioning position of the element and its impact on other page elements to ensure the best user experience and page layout effect.

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