Web Front-endHTML TutorialProblem with div background or background image of variable height not displaying_html/css_WEB-ITnose
When using div css for web page layout, if the external div has a background color or border without setting its height, it will display normally under the IE browser. However, when browsing using Firefox/opera, there is a problem that the background color and border of the outermost Div do not work.
General structure
<style>.a1 {width:100px;background:red;}.b1 {background:blue;width:50px;height:600px;}</style></head><body><div class="a1"> <div class="b1"></div></div> </body> Cause analysis: Because in Firefox and Opera: if the DIV inside is float (float) and the parent body will not calculate the child The height after the body float. This kind of calculation is supported in IE, so it works normally under IE.
So there are two prerequisites for this problem: 1. The outer div has no height set; 2. The inner div is floating (with the float attribute).
Generally, we are not sure of the height of the outer div, so we clear the float.
Realize how the background color or image inside the div will grow accordingly after it grows.
.a1{width:100px;background:red;height:auto !important; height:550px; min-height:550px;}.a1:after { content:"."; height:0; visibility:hidden; display:block; clear:both; } 1. Add code at the end of Div:
Or use
2. Use the after pseudo-class
This method is to use the after pseudo-class and content on the parent container Statement adds new content to the end of the specified current content. A common approach is to add a "dot" because it is smaller and less noticeable. Then we use it to clear the float (close the floated element) and hide the content.
This method has general compatibility, but after various hacks, it can cope with different browsers, and at the same time it can ensure that the html is relatively clean, so it is still used more often.
The code is as follows:
#a1:after{
content: ".";
height:0 ;
visibility:hidden;
display:block;
clear:both;
}
3. Set overflow to hidden or auto
This method is to set the overflow of the parent container to hidden or autot to close the floating element in a standard compatible browser.
However, when using overflow, it may affect the page performance, and This impact is uncertain, you'd better test your page on multiple browsers
4. Float external elements, float-in-float
This approach is Let the parent container also float, which takes advantage of a characteristic of floating elements? Floating elements will close floating elements. This method has good results in IE/Win and standard-compatible browsers, but the shortcomings are also obvious. The parent container may not float just because it wants to float. After all, floating is a special behavior, and sometimes the layout is not correct. Allowing it to float is also normal.
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
SublimeText3 Linux new version
SublimeText3 Linux latest version
Dreamweaver Mac version
Visual web development tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
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.
SublimeText3 Mac version
God-level code editing software (SublimeText3)
