Web Front-endCSS TutorialIn-depth analysis of absolute positioning in CSS and a thorough understanding of it!In-depth analysis of absolute positioning in CSS and a thorough understanding of it!
This article will analyze the absolute positioning in CSS and help you understand it thoroughly. I hope it will be helpful to everyone!
Positioning an element is not so much about locating the position of the element itself, but rather the position of the element's container. In order to be able to position itself, it must know which parent div it will be positioned relative to. [Related recommendation: "css video tutorial"]
The following code shows 4 nested divs, .box-1 to .box -3 Only use display: flex and margin: auto to achieve centering. .box-4 No margin is set and is at the default position in the document flow.
<body>
<div class="box-1">
<div class="box-2">
<div class="box-3">
<div class="box-4"></div>
</div>
</div>
</div>
</body>The position attribute is not set on all elements
body {
display: flex;
}
.box-1,
.box-2,
.box-3 {
display: flex;
margin: auto;
}
To position yourself, an element must know 2 things:##.box-4
in Default Position
- by
- top
,right,bottom,leftSet the value relative to which parent element to position
.box-4 After adding the position: absolute attribute, I found that it was separated from the normal document flow. Without setting the position property, it just stays in the default position, which is the upper left corner of the parent container.
##.box-4top : 0There is no position offset during absolute positioning
By adding
and left: 0 , the element must know which element will serve as the reference container for positioning. You can see that the element here is positioned in the upper left corner of the screen. .box-4 will first check whether its parent container has the position attribute set. At first, it found that .box-3 did not have a positioning attribute set, and then it continued to the next level .box-2 and .box-1, It was found that none of them set the available position attribute. In the end
failed to find a parent element that could be used for positioning reference, and in the end we could only use body as the positioning reference. The element is finally positioned in the upper left corner of the screen:
.box-4position: relativeAbsolute positioning, all parent elements are not set
When we setpositionProperties
to .box-1, .box-4 found that available positioning references. And finally achieved positioning relative to .box-1:
.box-4Absolute positioning,
Absolutely positioned elements will be relative to Position itself with its nearest ancestor element..box-1Relative positioning,.box-2and.box-3remain unchanged
Once an available ancestor element is found, other elements will no longer be related to it (such as box2 and box3). The picture below shows the effect of setting
position:relative to .box-2 and .box-3 respectively:
Absolute positioning,.box-2
Original address: https://juejin.cn/post/7008462323316686862and.box-3Relative positioning
Author: M Cool! !For more programming-related knowledge, please visit:
Introduction to Programming
The above is the detailed content of In-depth analysis of absolute positioning in CSS and a thorough understanding of it!. For more information, please follow other related articles on the PHP Chinese website!
Iterating a React Design with Styled ComponentsApr 21, 2025 am 11:29 AMIn a perfect world, our projects would have unlimited resources and time. Our teams would begin coding with well thought out and highly refined UX designs.
Oh, the Many Ways to Make Triangular Breadcrumb Ribbons!Apr 21, 2025 am 11:26 AMOh, the Many Ways to Make Triangular Breadcrumb Ribbons
SVG Properties in CSS GuideApr 21, 2025 am 11:21 AMSVG has its own set of elements, attributes and properties to the extent that inline SVG code can get long and complex. By leveraging CSS and some of the forthcoming features of the SVG 2 specification, we can reduce that code for cleaner markup.
A Few Functional Uses for Intersection Observer to Know When an Element is in ViewApr 21, 2025 am 11:19 AMYou might not know this, but JavaScript has stealthily accumulated quite a number of observers in recent times, and Intersection Observer is a part of that
Revisting prefers-reduced-motionApr 21, 2025 am 11:18 AMWe may not need to throw out all CSS animations. Remember, it’s prefers-reduced-motion, not prefers-no-motion.
How to Get a Progressive Web App into the Google Play StoreApr 21, 2025 am 11:10 AMPWA (Progressive Web Apps) have been with us for some time now. Yet, each time I try explaining it to clients, the same question pops up: "Will my users be
The Simplest Ways to Handle HTML IncludesApr 21, 2025 am 11:09 AMIt's extremely surprising to me that HTML has never had any way to include other HTML files within it. Nor does there seem to be anything on the horizon that
Change Color of SVG on HoverApr 21, 2025 am 11:04 AMThere are a lot of different ways to use SVG. Depending on which way, the tactic for recoloring that SVG in different states or conditions — :hover,
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
SublimeText3 English version
Recommended: Win version, supports code prompts!
SublimeText3 Chinese version
Chinese version, very easy to use
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
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
