


Today I finally have time to write an article. If there are any mistakes, please correct me. I just want beginners to avoid detours. When I was learning, I encountered obstacles everywhere. Some very simple questions such as " "Div CSS floating" was written so profoundly by some awesome people. It took me a long time to understand that it turned out that it was based on one attribute that involved all the eighteen generations of the ancestors of that tag! Not to mention....
First of all, you must be a web architect or will become one. To be honest, I am not very optimistic about this industry now because there are too many people doing this now. Well, who calls it IT? The more you do, the less valuable it becomes! Haha, let’s complain, now let’s get to the point!
1. Some BUG problems with float in IE6
When using float to layout in a web page, there will be some problems that are difficult to understand or even unbelievable for us, such as: In IE6, there will be a 3PX blank space on the right side. At this time, other browsers are very standard. We take it for granted that IE6 is lagging behind and few people will care about it now. But as a designer, you must be responsible for your work. In fact, the solution to this problem is very simple. Here we need to use some HACK technology and add a line in your css such as: .box{margin-right:0px; margin-right:-3px!important;} and that’s it! If you don’t know HACK technology, you can check it online, there are many!
2. Float confusion layout div css float
The most common problem is that when you use the float attribute on the two blocks above, the block below will appear on top. On the right side, this problem is a headache when designing, and it is also the most confusing thing for many beginners. Now this is actually very simple. Use the clear attribute of the clear element, which is to write a container under the above two divs such as:
#bb{float:left;width:480px;}
#aa{width:960px; margin-top:5px;}
#clear{clear:both;}
......
......
This will solve this long-standing problem.
3. Float appears with double spacing
When li uses the float attribute, double spacing will appear. That is, when you set the left margin of li to 3PX, but it will have a left margin of 6PX. , this can be solved by simply setting an inline attribute on the css of the li element: display:inline.
4. When the child element of unknown height is floated, let the parent element adapt to the height
You can add
#oo{ margin:0 auto;width:960px;}
#bb{float:left;width:480px; }
#aa{width:960px; margin-top:5px;}
#clear{clear:both;}
...
...
This is a common problem and solution for floating div css that I have encountered now. If there is something wrong, please correct me. Everyone is welcome to discuss together

To build a website with powerful functions and good user experience, HTML alone is not enough. The following technology is also required: JavaScript gives web page dynamic and interactiveness, and real-time changes are achieved by operating DOM. CSS is responsible for the style and layout of the web page to improve aesthetics and user experience. Modern frameworks and libraries such as React, Vue.js and Angular improve development efficiency and code organization structure.

Boolean attributes are special attributes in HTML that are activated without a value. 1. The Boolean attribute controls the behavior of the element by whether it exists or not, such as disabled disable the input box. 2.Their working principle is to change element behavior according to the existence of attributes when the browser parses. 3. The basic usage is to directly add attributes, and the advanced usage can be dynamically controlled through JavaScript. 4. Common mistakes are mistakenly thinking that values need to be set, and the correct writing method should be concise. 5. The best practice is to keep the code concise and use Boolean properties reasonably to optimize web page performance and user experience.

HTML code can be cleaner with online validators, integrated tools and automated processes. 1) Use W3CMarkupValidationService to verify HTML code online. 2) Install and configure HTMLHint extension in VisualStudioCode for real-time verification. 3) Use HTMLTidy to automatically verify and clean HTML files in the construction process.

HTML, CSS and JavaScript are the core technologies for building modern web pages: 1. HTML defines the web page structure, 2. CSS is responsible for the appearance of the web page, 3. JavaScript provides web page dynamics and interactivity, and they work together to create a website with a good user experience.

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The 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.

The 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 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.


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