How to implement CSS Positions layout with precise positioning-CSS Tutorial-php.cn

How to implement CSS Positions layout with precise positioning

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Release： 2023-09-26 10:30:11

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如何实现精确定位的CSS Positions布局

How to achieve precise positioning of CSS Positions layout

CSS Positions layout is a very important technology in front-end development. It can achieve precise positioning of elements during the web page layout process. Positioning and alignment. By using the CSS Positions property, elements can be positioned to a specified position on the page, and this can be achieved through specific code examples. This article will introduce how to implement a precisely positioned CSS Positions layout.

1. Relative positioning (position: relative)
Relative positioning refers to positioning relative to the original position of the element itself. The specific position of the element is determined by setting top, right, bottom, and left.
For example, the following is a sample code:

<!DOCTYPE html>
<html>
<head>
<style>
div.relative {
  position: relative;
  left: 50px;
  top: 50px;
  border: 3px solid #73AD21;
}
</style>
</head>
<body>

<h2>相对定位</h2>
<p>使用 top, bottom, left 和 right 属性来定位元素：</p>

<div class="relative">这是一个相对定位的 div 元素。</div>

</body>
</html>

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In the above sample code, position: relative; is used to set the element as relative positioning. Next, by setting the left and top properties to 50px, move the element 50px to the right and down relative to its original position.

2. Absolute positioning (position: absolute)
Absolute positioning refers to positioning relative to its parent element, and determines the specific position of the element by setting top, right, bottom, and left.
For example, the following is a sample code:

<!DOCTYPE html>
<html>
<head>
<style>
div.container {
  position: relative;
  width: 200px;
  height: 200px;
  border: 3px solid;
  padding: 20px;
}

div.absolute {
  position: absolute;
  top: 50px;
  right: 50px;
  width: 100px;
  height: 100px;
  border: 3px solid #73AD21;
}
</style>
</head>
<body>

<h2>绝对定位</h2>
<p>使用 top, bottom, left 和 right 属性来定位元素：</p>

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

</body>
</html>

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In the above sample code, a relative container is first created as the parent element, and then an absolutely positioned absolute child element is created within the container, through Set the top: 50px; and right: 50px; attributes to position the absolute element relative to the upper right corner of the parent element.

3. Fixed positioning (position: fixed)
Fixed positioning refers to positioning relative to the browser window, and determines the specific position of the element by setting the top, right, bottom, and left attributes.
For example, the following is a sample code:

<!DOCTYPE html>
<html>
<head>
<style>
div.fixed {
  position: fixed;
  bottom: 0;
  right: 0;
  width: 300px;
  border: 3px solid #73AD21;
}
</style>
</head>
<body>

<h2>固定定位</h2>
<p>通过设置 top, bottom, left 和 right 属性把 div 定位到浏览器窗口的右下角：</p>

<div class="fixed">这是一个固定定位的 div 元素。</div>

</body>
</html>

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In the above sample code, position: fixed; is used to set the element as fixed positioning. Next, position the element to the lower right corner of the browser window by setting the bottom: 0; and right: 0; attributes.

Through the above sample code, we can see the application and effects of different positioning attributes. Precisely positioned CSS Positions layout is often used in front-end development to achieve precise positioning and alignment of elements in web page layout. Using appropriate positioning attributes and specific code examples, you can achieve more precise page layout effects. I hope this article is helpful to you. If you have more questions or questions, please feel free to ask and communicate.

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