Introduction
CSS Position has four properties:
relative absolute fixed static (default)Example
<div id="parent"> <div id="sub1">sub1</div> <div id="sub2">sub2</div></div>
sub1 and sub2 are of the same level relationship, parent is their parent element.
1. relative (relative positioning)
Relative positioning refers to the positioning relative to the original position of this element, and will occupy the original position.
The so-called original position refers to its position when the relative attribute is not set (that is, the position when the static attribute is used)
The relative offset is relative to the upper left side of the margin.
For example, after setting the relative attribute to sub1, it will be offset according to the top, right, bottom, and left attributes, while the position of sub2 remains unchanged (sub1 will occupy the original position)
If you set the relative attribute to sub2, it will also be offset relative to its original position (the sub2 position will still be occupied)
2. absolute (absolute positioning)
Absolute positioning is based on the upper left corner of the padding of the most recently positioned parent object. It is basically divided into the following two situations:
For example, sub1 Set absolute. If the parent element of sub1 (parent or its parent element) is set to absolute or relative, then sub1 will be positioned relative to the parent element. If the parent element is not set to absolute or relative, then sub1 is positioned relative to the body.At this time, since the position of sub1 is "vacated", sub2 will move to the position of sub1 (you can also understand that sub1 floats, which is called a layer in Dreamweaver), and its document flow will be based on parent.
If absolute is set to sub2, it will also be relative to parent.
3. fixed
fixed is a special absolute, that is, fixed always uses the body as the positioning object and is positioned according to the browser window.
4. static (default)
The default value of position. Generally, when the position attribute is not set, it will be arranged according to the normal document flow.
Reference:
http://www.cnblogs.com/Zigzag/archive/2009/02/19/position.html
http://www.w3school .com.cn/css/css_positioning.asp

The official account web page update cache, this thing is simple and simple, and it is complicated enough to drink a pot of it. You worked hard to update the official account article, but the user still opened the old version. Who can bear the taste? In this article, let’s take a look at the twists and turns behind this and how to solve this problem gracefully. After reading it, you can easily deal with various caching problems, allowing your users to always experience the freshest content. Let’s talk about the basics first. To put it bluntly, in order to improve access speed, the browser or server stores some static resources (such as pictures, CSS, JS) or page content. Next time you access it, you can directly retrieve it from the cache without having to download it again, and it is naturally fast. But this thing is also a double-edged sword. The new version is online,

The article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.

This article demonstrates efficient PNG border addition to webpages using CSS. It argues that CSS offers superior performance compared to JavaScript or libraries, detailing how to adjust border width, style, and color for subtle or prominent effect

Article discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.

The article discusses the HTML <datalist> element, which enhances forms by providing autocomplete suggestions, improving user experience and reducing errors.Character count: 159

The article discusses the HTML <progress> element, its purpose, styling, and differences from the <meter> element. The main focus is on using <progress> for task completion and <meter> for stati

This article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit

The article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

SublimeText3 Mac version
God-level code editing software (SublimeText3)

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver CS6
Visual web development tools

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
