What is sticky positioning

Sticky positioning is a CSS property used to control the positioning behavior of elements when scrolling. It is positioned relative to the viewport or container. When the page scrolls, the element can be fixed at a specific position on the page, providing a better user experience. Sticky positioning has a wide range of application scenarios, and is especially suitable for elements that need to maintain a fixed position when the page is scrolled, such as navigation bars, sidebars, advertising banners, prompt boxes, etc. By using sticky positioning, you can provide a better user experience by making these elements always visible, making it easier for users to operate and navigate.

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

Sticky Positioning is a CSS property used to control the positioning behavior of elements when scrolling. It is positioned relative to the viewport or container. When the page scrolls, the element can be fixed at a specific position on the page, providing a better user experience.

Sticky positioning is different from other common positioning methods (such as relative positioning, absolute positioning and fixed positioning). Relative positioning is positioning relative to the original position of the element itself, absolute positioning is positioning relative to the nearest positioned ancestor element, and fixed positioning is positioning relative to the viewport. Sticky positioning switches the positioning method during scrolling. It can be positioned relative to the viewport or relative to the container.

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 features of sticky positioning are as follows:

1. Switch positioning mode: When the element reaches the specified position during scrolling, it will switch to fixed positioning and remain at 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 application scenarios of sticky positioning are very wide, especially suitable for elements that need to maintain a fixed position when the page is scrolled, such as navigation bars, sidebars, advertising banners, prompt boxes, etc. By using sticky positioning, you can provide a better user experience by making these elements always visible, making it easier for users to operate and navigate.

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