Detailed explanation of common absolute positioning problems and solutions

Absolute positioning fault list: Common problems and solutions you should know, specific code examples are required

Abstract: Absolute positioning is a type often used in front-end development Typesetting method, but some problems are often encountered during use. This article will introduce several common absolute positioning faults, and give corresponding solutions and specific code examples to help readers better understand and deal with these problems.

1. What is absolute positioning
Absolute positioning is a CSS positioning method that detaches an element from the ordinary document flow and positions it relative to its nearest non-static ancestor element. It can precisely control the position of elements on the page, making the page layout more flexible and diverse.

2. Common absolute positioning faults and solutions

1. Inaccurate element position offset
   Sometimes when using absolute positioning, the position of the element will be different from the expected position There is some deviation. This is usually caused by not setting the top, bottom, left, and right properties correctly.

Solution: Make sure the top, bottom, left, and right attributes of the element are set and the position value is calculated correctly. The sample code is as follows:

<style>
  .box {
    position: absolute;
    top: 50px;
    left: 100px;
  }
</style>

<div class="box">这是一个绝对定位的元素</div>

2. Elements block each other
   When multiple absolutely positioned elements overlap, occlusion may occur. This is caused by the stacking order (z-index) of the elements not being set correctly.

Solution: Make sure the z-index property of the element is set correctly to adjust the stacking order of the elements. The sample code is as follows:

<style>
  .box1 {
    position: absolute;
    top: 50px;
    left: 100px;
    z-index: 1;
  }

  .box2 {
    position: absolute;
    top: 70px;
    left: 120px;
    z-index: 2;
  }
</style>

<div class="box1">这是第一个绝对定位的元素</div>
<div class="box2">这是第二个绝对定位的元素</div>

3. Element follows scroll
   Sometimes we want an absolutely positioned element not to move with scrolling, but in fact it will follow scrolling and change position. This is caused by not setting the appropriate positioning reference object (positioned ancestor).

Solution: Make sure the position attribute of the positioning reference object is set to relative or absolute. The sample code is as follows:

<style>
  .box {
    position: absolute;
    top: 50px;
    left: 100px;
    position: relative; /* 设置定位参考对象 */
  }
</style>

<div class="box">这是一个绝对定位的元素</div>

4. Element overflows the parent container
   When an absolutely positioned element exceeds the boundary of the parent container, overflow will occur. This is caused by the parent container not setting the appropriate position attribute or overflow attribute.

Solution: Make sure the parent container sets the position attribute to relative or absolute, and sets the overflow attribute to hidden. The sample code is as follows:

<style>
  .container {
    position: relative; /* 设置定位参考对象 */
    overflow: hidden; /* 隐藏溢出内容 */
  }

  .box {
    position: absolute;
    top: 50px;
    left: 100px;
  }
</style>

<div class="container">
  <div class="box">这是一个绝对定位的元素</div>
</div>

3. Conclusion
This article introduces some common problems of absolute positioning and corresponding solutions, and gives specific code examples. It is hoped that through these examples, readers can better understand absolute positioning and be able to avoid or solve these problems in actual development. At the same time, readers are also reminded to carefully consider the position, stacking order, positioning reference object, and attribute settings of the parent container when using absolute positioning to ensure the accuracy and beauty of the page layout.

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