Learn the common attribute values ​​​​of absolute positioning and create a unique web page layout

To learn the common attribute values ​​​​of absolute positioning and create a unique web page layout, specific code examples are required

1. Introduction
Today, web design has become a daily routine for people part of life. In order to make the web page layout more unique and beautiful, we can use the absolute positioning attribute in CSS to achieve it. This article will introduce the common attribute values ​​of absolute positioning and provide code examples to help readers learn and apply them better.

2. The concept and function of absolute positioning
Absolute positioning is a positioning method in CSS that allows us to accurately place elements at specified locations on web pages. Compared with other positioning methods, absolute positioning is independent and can be separated from the document flow. This means that an absolutely positioned element will remain in a specific position even if other elements change.

3. Commonly used absolute positioning attribute values

1. top, right, bottom, left:
2. top: Specifies the distance between the top of the element relative to the top of the parent container;
3. right: Specify the distance from the right side of the element relative to the right side of the parent container;
4. bottom: Specify the distance from the bottom of the element relative to the bottom of the parent container;
5. left: Specify the element The distance of the left side relative to the left side of the parent container.

The following code example demonstrates how to perform absolute positioning through the top and left attributes:

<style>
#myElement {
    position: absolute;
    top: 50px;
    left: 100px;
}
</style>
<div id="myElement">
    我是一个绝对定位的元素
</div>

2. z-index:
3. z-index can be controlled The vertical stacking order of elements, with elements with higher z-index values ​​covering elements with lower values.

The following code example demonstrates how to use the z-index attribute to cascade two absolutely positioned elements:

<style>
#element1 {
    position: absolute;
    top: 100px;
    left: 100px;
    background-color: green;
    z-index: 1;
}
#element2 {
    position: absolute;
    top: 150px;
    left: 150px;
    background-color: red;
    z-index: 2;
}
</style>
<div id="element1">
    我是元素1
</div>
<div id="element2">
    我是元素2
</div>

3. position: relative;
4. Relative positioning is a complementary attribute value to absolute positioning that allows an element to be positioned relative to its own position and still remain within the document flow.

The following code example demonstrates how to use relative positioning to achieve absolute positioning:

<style>
#parent {
    position: relative;
    width: 400px;
    height: 300px;
    background-color: lightgray;
}
#child {
    position: absolute;
    top: 50px;
    left: 50px;
    width: 100px;
    height: 100px;
    background-color: red;
}
</style>
<div id="parent">
    <div id="child">
        我是一个相对定位的元素
    </div>
</div>

4. Summary
Absolute positioning is one of the important tools to achieve unique web page layout. By mastering the common attribute values ​​​​of absolute positioning, we can accurately place elements at specified positions and control their stacking order. We hope that the code examples provided in this article can help readers better understand and apply the relevant knowledge of absolute positioning and create unique and cool web page layouts.

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