What is the principle of relative positioning?

The positioning principle is to fine-tune the position of the element in the normal document flow by changing the position attribute of the element. When an element is set to relative positioning, it will move relative to its position in the normal document flow. Relative positioning uses the top, right, bottom, and left attributes to offset the position of the element, and this offset only It affects the element itself and its overlapping elements, but does not affect the layout of other elements. Relative positioning does not change the stacking order of elements; elements remain in their position in the normal document flow.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Relative positioning is a CSS positioning method that allows us to fine-tune an element's position relative to the normal document flow. The principle of relative positioning is achieved by changing the position attribute of the element.

In CSS, the position attribute of an element can have multiple values, including static, relative, fixed and absolute. Relative positioning is achieved by setting the position attribute of the element to relative.

When an element is set to relative positioning, it moves relative to its position in the normal document flow. An element is moved relative to its position in the normal document flow without affecting the layout of other elements.

Specifically, the principle of relative positioning can be summarized as the following points:

The initial position of the element: When an element is set to relative positioning, its The initial position corresponds to its position in the normal document flow.

Position offset: By using the top, right, bottom and left attributes, we can offset the position of relatively positioned elements. These properties allow us to specify an element's offset relative to its position in the normal document flow. , setting top to 10px will move the element down 10 pixels.

The impact scope of offset: Relative positioning offset will only affect the element itself and other overlapping elements, and will not affect the layout of other elements. This is a difference between relative positioning and absolute positioning. The offset of absolute positioning affects the layout of other elements.

Stacking order of elements: Relative positioning does not change the stacking order of elements, and the elements still maintain their position in the normal document flow. If the stacking order of elements needs to be changed, the CSS property z-index can be used.

Summary

The principle of relative positioning is to fine-tune the position of the element in the normal document flow by changing the position attribute of the element. By using the top, right, bottom and left attributes, you can offset the position of the element, and this offset will only affect the element itself and its overlapping elements, and will not affect the layout of other elements. Relative positioning does not change the stacking order of elements. If you need to change the stacking order, you can use the z-index attribute.

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