What are the characteristics of absolute positioning?

The characteristics of absolute positioning include separation from the document flow, relative positioning reference points, positioning through top, right, bottom and left attributes, hierarchical relationships can be controlled using the z-index attribute, and transformation can be performed through the transform attribute. Transition and animation effects can be achieved through the transition and animation attributes, and style modifications can be performed through pseudo elements. Detailed introduction: 1. Break away from the document flow. Elements using absolute positioning will break away from the document flow and no longer occupy their original position, etc.

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

Absolute positioning (Absolute positioning) is a commonly used positioning method in CSS, which can position an element relative to its nearest positioned ancestor element. Absolute positioning has the following characteristics:

1. Breaking away from the document flow:

Elements using absolute positioning will break away from the document flow and no longer occupy their original position. This means that other elements will no longer consider the existence of this absolutely positioned element and will not affect it. Absolutely positioned elements can be moved freely without affecting the layout of other elements.

2. Reference point for relative positioning:

Absolutely positioned elements are positioned relative to their nearest positioned ancestor elements. If there are no positioned ancestors, positioning is relative to the original containing block. This containing block is usually the browser's visual window or the nearest ancestor element with a positioning attribute (the position attribute value is relative, absolute, fixed, or sticky).

3. You can position it through the top, right, bottom and left attributes:

Absolutely positioned elements can specify their position in the parent element through the top, right, bottom and left attributes. . These properties can be positioned using pixels (px), percentages (%), or other units. By adjusting the values ​​of these properties, you can precisely control the position of elements on the page.

4. You can use the z-index attribute to control the hierarchical relationship:

Absolutely positioned elements can use the z-index attribute to control their hierarchical relationship in the stacking context. The larger the value of the z-index attribute, the higher the element is in the stacking context and the easier it is to cover other elements. By properly setting the value of the z-index attribute, the cascading effect of elements can be achieved.

5. Transformation can be performed through the transform attribute:

Absolutely positioned elements can use the transform attribute to perform 2D or 3D transformation effects, such as rotation, scaling, tilting, etc. Through the transform attribute, you can achieve some cool animation effects and increase the interactivity and attractiveness of the page.

6. Transition and animation effects can be achieved through the transition and animation attributes:

Absolutely positioned elements can use the transition and animation attributes to achieve smooth transition and animation effects. By setting the values ​​of these attributes, you can control the change process of elements over a period of time, thereby achieving dynamic page effects.

7. Style modification can be done through pseudo-elements:

Absolutely positioned elements can use pseudo-elements (such as: before and: after) to add additional style modifications. Through pseudo elements, you can insert content before and after elements and set styles to increase the decoration and beauty of the page.

To sum up, absolute positioning has a reference point that is separated from the document flow and relative positioning. It can be positioned through the top, right, bottom and left attributes. You can use the z-index attribute to control the hierarchical relationship and you can transform it through the transform attribute. , transition and animation effects can be achieved through transition and animation attributes, and style modification can be performed through pseudo elements. Understanding the characteristics of absolute positioning can help us better use and master this positioning method to achieve more flexible and diverse page layouts and effects.

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