The similarities, differences and connections between absolute positioning and relative positioning

The difference and connection between absolute positioning and relative positioning

In web design and development, positioning is one of the very important concepts. Among them, absolute positioning and relative positioning are two commonly used positioning methods. This article will explore the differences and connections between absolute positioning and relative positioning, and illustrate them with specific code examples.

1. The difference between absolute positioning and relative positioning

1. Different definitions:
   Absolute positioning means that the positioning of an element has nothing to do with the positioning of the document, but is relative to the parent Elements are positioned.
   Relative positioning refers to positioning an element relative to the document or parent element.
2. The impact on other elements is different:
   The absolutely positioned element is out of the document flow and will not have any impact on other elements. The layout of other elements will not be affected by the absolutely positioned element.
   Relatively positioned elements are still in the document flow, and the layout of other elements will still be affected by the relatively positioned elements.
3. Different positioning methods:
   Absolute positioning requires positioning by setting the positioning attributes of the element (top, right, bottom, left).
   Relative positioning is performed by setting the offset of the element (top, right, bottom, left).
4. Different positioning references:
   Absolute positioning is positioned relative to the parent element. If there is no parent element, it is positioned relative to the entire document.
   Relative positioning is relative to the original position of the element itself in the document.

2. The relationship between absolute positioning and relative positioning

1. You can also adjust the position by using the positioning attributes (top, right, bottom, left).
   Absolute positioning can change the position of the element in the parent element by adjusting the value of the positioning attribute.
   Relative positioning can change the offset of the element relative to its original position by adjusting the value of the positioning attribute.
2. You can also set the stacking order of elements by using the z-index attribute.
   Both absolutely positioned and relatively positioned elements can control the display order of elements by setting the z-index attribute to achieve a cascading effect.
3. Can also be used in combination with other positioning methods.
   Both absolute positioning and relative positioning can be combined with other positioning methods (such as fixed positioning and floating positioning) to flexibly layout elements.

The following uses specific code examples to illustrate the use of absolute positioning and relative positioning:

Absolute positioning code examples:

<div style="position: relative;">
  <div style="position: absolute; top: 50px; left: 50px; background-color: red;">
    绝对定位元素
  </div>
</div>

In the above code, the positioning attribute of the parent element is set to relative positioning, and then the positioning attribute of the child element is set to absolute positioning, and the position of the child element in the parent element is adjusted by setting the top and left attributes.

Relative positioning code example:

<div style="position: relative; top: 50px; left: 50px; background-color: blue;">
  相对定位元素
</div>

In the above code, directly set the positioning attribute of the element to relative positioning, and adjust the relative positioning of the element by setting the top and left attributes. offset from the original position.

Absolute positioning and relative positioning are very commonly used positioning methods in web design and development. Mastering their differences and connections and their correct usage can better realize the layout and effect of web pages. I hope this article can provide readers with a deeper understanding and application of absolute positioning and relative positioning.

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