Web Front-endCSS TutorialDetailed explanation of the mainstream method of clearing floats by the after pseudo-class in CSS!
This article mainly introduces how to use css after pseudo-class to clear floating .
First of all, everyone needs to understandWhat is css floating?
Make the element break away from the document flow, move in the specified direction, and stop when it encounters the parent boundary or adjacent floating elements.
It can also be understood like this: a floating box can move left or right until its outer edge touches the border of the containing box or another floating box. Because the floated box is not in the document's normal flow, a block box in the document's normal flow behaves as if the floated box does not exist.
So why do we clear floats?
This is because floating elements sometimes affect the overall layout and cause some bugs.
The following code:
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>css浮动示例</title>
<head>
<style>
.demo{
background: #ffffff;
border: 1px solid black;
margin: 50px auto;
padding: 50px;
}
.demo1{
float: left;
width: 100px;
height: 50px;
color: white;
background: #1094f2;
border: 1px solid black;
}
.demo2{
float: left;
width: 100px;
height: 50px;
color: white;
background: #9492ff;
border: 1px solid black;
}
</style>
</head>
<body>
<div class="demo">
<div class="demo1">demo1</div>
<div class="demo2">demo2</div>
</div>
</body>
</html>The effect is as shown below:
You can see in the picture that we are setting the floating attribute float for demo1.2 After :left, the parent div is not opened. And we did not set the width and height dimensions for the demo.
Here we must first understand what the floating attribute is in css?
float attributeDefines in which direction the element floats. Historically this property has always been applied to images, causing the text to wrap around the image, but in CSS, any element can be floated. A floated element creates a block-level box, regardless of what type of element it is.
So when we encounter some floats that affect the layout, how do we clear them?
The following will introduce to you the most mainstream cleaning method, using css after pseudo-class.
Just add the following code:
.demo:after{
clear: both;
content: '';
display: block;
}The final effect is as follows:
In fact, the main principle is:
Use :after and :before to insert two element blocks into the element to achieve the effect of clearing floats.
This article is about the specific method of clearing floats using the after pseudo-class. It is very simple and easy to understand. I hope it will be helpful to friends in need! 】
If you want to learn more about front-end related knowledge, you can follow the PHP Chinese website CSS video tutorial, Bootstrap tutorial and other related tutorials. Welcome everyone to refer to and learn!
The above is the detailed content of Detailed explanation of the mainstream method of clearing floats by the after pseudo-class in CSS!. For more information, please follow other related articles on the PHP Chinese website!
@keyframes vs CSS Transitions: What is the difference?May 14, 2025 am 12:01 AM@keyframesandCSSTransitionsdifferincomplexity:@keyframesallowsfordetailedanimationsequences,whileCSSTransitionshandlesimplestatechanges.UseCSSTransitionsforhovereffectslikebuttoncolorchanges,and@keyframesforintricateanimationslikerotatingspinners.
Using Pages CMS for Static Site Content ManagementMay 13, 2025 am 09:24 AMI know, I know: there are a ton of content management system options available, and while I've tested several, none have really been the one, y'know? Weird pricing models, difficult customization, some even end up becoming a whole &
The Ultimate Guide to Linking CSS Files in HTMLMay 13, 2025 am 12:02 AMLinking CSS files to HTML can be achieved by using elements in part of HTML. 1) Use tags to link local CSS files. 2) Multiple CSS files can be implemented by adding multiple tags. 3) External CSS files use absolute URL links, such as. 4) Ensure the correct use of file paths and CSS file loading order, and optimize performance can use CSS preprocessor to merge files.
CSS Flexbox vs Grid: a comprehensive reviewMay 12, 2025 am 12:01 AMChoosing Flexbox or Grid depends on the layout requirements: 1) Flexbox is suitable for one-dimensional layouts, such as navigation bar; 2) Grid is suitable for two-dimensional layouts, such as magazine layouts. The two can be used in the project to improve the layout effect.
How to Include CSS Files: Methods and Best PracticesMay 11, 2025 am 12:02 AMThe best way to include CSS files is to use tags to introduce external CSS files in the HTML part. 1. Use tags to introduce external CSS files, such as. 2. For small adjustments, inline CSS can be used, but should be used with caution. 3. Large projects can use CSS preprocessors such as Sass or Less to import other CSS files through @import. 4. For performance, CSS files should be merged and CDN should be used, and compressed using tools such as CSSNano.
Flexbox vs Grid: should I learn them both?May 10, 2025 am 12:01 AMYes,youshouldlearnbothFlexboxandGrid.1)Flexboxisidealforone-dimensional,flexiblelayoutslikenavigationmenus.2)Gridexcelsintwo-dimensional,complexdesignssuchasmagazinelayouts.3)Combiningbothenhanceslayoutflexibilityandresponsiveness,allowingforstructur
Orbital Mechanics (or How I Optimized a CSS Keyframes Animation)May 09, 2025 am 09:57 AMWhat does it look like to refactor your own code? John Rhea picks apart an old CSS animation he wrote and walks through the thought process of optimizing it.
CSS Animations: Is it hard to create them?May 09, 2025 am 12:03 AMCSSanimationsarenotinherentlyhardbutrequirepracticeandunderstandingofCSSpropertiesandtimingfunctions.1)Startwithsimpleanimationslikescalingabuttononhoverusingkeyframes.2)Useeasingfunctionslikecubic-bezierfornaturaleffects,suchasabounceanimation.3)For
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
SublimeText3 Chinese version
Chinese version, very easy to use
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
Notepad++7.3.1
Easy-to-use and free code editor
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
