What is sticky positioning?

Sticky positioning is a CSS positioning method that allows elements to remain in a specific position on the page when scrolling. The characteristics of sticky positioning are that it can switch positioning methods, combine relative positioning and fixed positioning, position relative to the viewport or container, and has good compatibility. The method of using sticky positioning is very simple. Just set the position attribute of the element to sticky. You also need to specify the offset value of the element when scrolling to determine the position of the element relative to the viewport or container. By rationally using sticky positioning, you can provide a better user experience and enhance the navigation of web pages.

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

Sticky Positioning is a CSS positioning method that allows elements to remain in a specific position on the page when scrolling. Unlike common positioning methods (relative positioning, absolute positioning, and fixed positioning), sticky positioning has some unique characteristics.

The characteristics of sticky positioning are as follows:

1. Switch positioning mode: Sticky positioning can switch positioning mode during scrolling. When the element reaches the specified position, it switches to fixed positioning and remains in that position. When the page scrolls beyond the specified position, elements resume normal document flow.

2. Combination of relative positioning and fixed positioning: Sticky positioning has the characteristics of relative positioning, which can occupy the position in the document flow, and fixed positioning, which can be fixed at a specific position on the page.

3. Position relative to the viewport or container: Sticky positioning can be positioned relative to the viewport or container. When set to position relative to the viewport, the element is positioned relative to the entire window; when set to position relative to the container, the element is positioned relative to the nearest container with a scrolling mechanism.

4. Good compatibility: Sticky positioning is widely supported in modern browsers, including Chrome, Firefox, Safari and Edge. For browsers that do not support sticky positioning, elements are displayed according to normal document flow.

The method of using sticky positioning is very simple. You only need to set the position attribute of the element to sticky. At the same time, you also need to specify the offset value (top, bottom, left, right) of the element when scrolling to determine the position of the element relative to the viewport or container.

Here is an example:

.sticky-element {
  position: sticky;
  top: 20px; /* 元素相对于视口的偏移值 */
}

In the above example, elements of the .sticky-element class will be set to sticky positioning and remain 20 pixels from the top of the viewport while scrolling Location.

The main uses of sticky positioning include:

1. Fixed navigation bar: Keep the navigation bar at the top or bottom of the page when the page scrolls, providing a better navigation experience.

2. Fixed sidebar: Keep the sidebar on one side of the page when the page scrolls, making it easier for users to view related content.

3. Ad fixation: Fix the position of the ad to ensure that the ad is always visible and increase the exposure rate of the ad.

4. Suspended prompt box: Create a suspended prompt box to provide users with tips, guidance or important information.

5. Paging navigation: Fixed paging navigation to facilitate users to switch between different pages or content.

6. Fixed header: Keep the header of the table at the top of the page when the table content is scrolled, improving the readability of the table.

In short, sticky positioning is a very practical CSS positioning method that can fix the position of elements when scrolling. By rationally using sticky positioning, you can provide a better user experience and enhance the navigation, readability and interactivity of web pages.

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