Quick fixed positioning, or "Sticky positioning", is a CSS positioning method that is positioned relative to the parent container or window. It combines the characteristics of relative positioning and fixed positioning. Quick fixed positioning can be used when the element reaches a certain Switch the positioning method when the threshold is reached, so that the element maintains a fixed position or returns to the normal document flow. It should be noted that fast fixed positioning may not be supported in some older browsers, so browser compatibility needs to be considered when using it. .
# Operating system for this tutorial: Windows 10 system, Dell G3 computer.
Sticky positioning (Sticky positioning) is a CSS positioning method that is positioned relative to the parent container or window. It combines the characteristics of relative positioning and fixed positioning. Quick fixed positioning can switch positioning methods when an element reaches a certain threshold, allowing the element to remain in a fixed position or return to normal document flow.
The structure of quick fixed positioning includes the following key points:
- Add the position: sticky; style to the elements that need to be applied to quick fixed positioning.
- Specify an offset (top, bottom, left, or right) relative to the parent container or viewport to determine where the fixed positioning of the element begins.
- You can set the z-index attribute to adjust the position of the element in the stacking order.
- During the scrolling process, the element will switch to fixed positioning or return to the normal document flow when it reaches the specified threshold according to the setting of the scroll position and offset.
For example, the following is a sample code to achieve fast fixed positioning:
.sticky-element {
position: sticky;
top: 20px; /* 相对于父级容器或视窗的偏移量 */
z-index: 100; /* 层叠顺序 */
}
In the above code, .sticky-element is required to be applied Quickly fixed positioning element selector, set it to quick fixed positioning through position: sticky; Then, use the top property to specify an offset relative to the parent container or viewport. Finally, you can use the z-index property to adjust the position of an element in the stacking order.
It should be noted that quick fixed positioning may not be supported in some older browsers, so browser compatibility needs to be considered when using it.
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