The position attribute specifies the positioning type of the element
This attribute defines the positioning mechanism used to establish the layout of the element. Any element can be positioned, but absolute or fixed elements generate a block-level box, regardless of the type of the element itself. A relatively positioned element is offset from its default position in normal flow.
| absolute Absolute positioning |
The position of the element is specified through the "left", "top", "right" and "bottom" attributes.
| ||||||||||
| fixed Fixed positioning | Generate absolutely positioned elements, positioned relative to the browser window. The position of the element is specified through the "left", "top", "right" and "bottom" attributes.
| ||||||||||
| relative Relative positioning | Generates a relatively positioned element, positioned relative to its normal position. So "left:20" adds 20 pixels to the element's LEFT position.
| ||||||||||
| static | Default value. Without positioning, the element appears in normal flow (ignoring top, bottom, left, right or z-index declarations). | ||||||||||
| inherit | Specifies that the value of the position attribute should be inherited from the parent element. |
The above is excerpted from W3C’s definition of position
After trying and searching for information, I summarized the following points:
1. static, inherit: Well, I happily decided to ignore it. Come on (sweat!!!);
<html> <head> <style type="text/css"> .div1{ position: relative; border: 10px solid red; padding: 10px; width: 100px; height: 100px; background-color: green; background-clip: content-box; } .div2{ positon: absolute; width: 50px; height: 50px; background-color: yellow; left: 10px;//此处left会以padding开始定位 } </style> </head> <body> <div class='div1'>div1 <div class='div2'>div2</div> </div> </body></html>2. fixed: positioned relative to the visible part of the browser; (depends on the browser) 3. relative: positioned relative to the normal flow ; (Depends on the normal position of the element itself)
4. Absolute: Positioning relative to the first parent element whose position attribute is not static (it’s really a twist, this is something I didn’t grasp at the beginning. If There is no position attribute in the parent element, or the position attributes are all static, which will rely on body positioning)
Of course, there are four diamonds in the box model: content, padding, border, and margin. Keep in mind that absolute will position
based on content adding (that is, the position where padding starts). Rendering:
1 <html> 2 <head> 3 <style type="text/css"> 4 .div1{ 5 position: relative; 6 border: 10px solid red; 7 padding: 10px; 8 width: 100px; 9 height: 100px;10 background-color: green;11 background-clip: content-box;12 }13 14 .div2{15 positon: absolute;16 width: 50px;17 height: 50px;18 background-color: yellow;19 margin: 10px;20 }21 </style>22 </head>23 24 <body>25 <div class='div1'>div126 <div class='div2'>div2</div>27 </div>28 </body>29 </html>
A pitfall was discovered during the experiment! ! ! ! ! ! What will be the effect if left is changed to margin in the above code?
Although only one attribute has been changed, please attach the code:
Still the rendering:
The margin attribute is based on the content of the parent element.
Hmm, don’t be fooled next time.
The Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AMThe future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.
HTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AMThe roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.
The Future of HTML: Evolution and Trends in Web DesignApr 17, 2025 am 12:12 AMThe future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.
HTML vs. CSS vs. JavaScript: A Comparative OverviewApr 16, 2025 am 12:04 AMThe roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.
HTML: Is It a Programming Language or Something Else?Apr 15, 2025 am 12:13 AMHTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.
HTML: Building the Structure of Web PagesApr 14, 2025 am 12:14 AMHTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.
From Text to Websites: The Power of HTMLApr 13, 2025 am 12:07 AMHTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.
Understanding HTML, CSS, and JavaScript: A Beginner's GuideApr 12, 2025 am 12:02 AMWebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
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
Dreamweaver Mac version
Visual web development tools
WebStorm Mac version
Useful JavaScript development tools
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
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
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.
