注意:觉得简单的人,别说话,悄悄的。。。。我也纯属是记录
网页默认存在margin值和padding值,并且后面的元素对margin、padding的修改过程中并不会生效,因此在样式设置过程中首先对所有的元素的margin和padding值清0;
代码:*{padding:0px;margin:0px;} //*号代表所有
可以在后面的元素上设置你想要的margin和padding值,都会生效;
举一个例子:(就是因为这一个原因,累死宝宝了,想法是挺符合逻辑的,不过就是不是你想要的)
我是仿照imooc网站的的导航做的(全当练手,因为我是新手,什么都想试一试)
以下是代码部分
<span style="font-size: 16px;"> <div class="nav"> <ul> <li><a href="#">评论</a></li> <li><a href="#">问答</a></li> <li><a href="#">笔记</a></li> <li><a href="#">同学代码</a></li> </ul> </div></span><br><span style="color: #ff0000; font-size: 16px;"><strong>css样式</strong></span>
<span style="font-size: 16px;">*{ margin:0px; padding:0px; } .nav{ border-bottom:1px solid #c0c0c0; width:1000px; height:60px; margin-left:40px; //background-color:#c3ffdd; } ul li{ list-style-type:none; width:120px; float:left; } li a{ display:block; text-decoration:none; color:black; font-family:"微软雅黑"; text-align:center; line-height:60px; } li a:hover,li a:active{ color:#f00; } li a:focus{ border-bottom:2px solid #f00; }</span><br><span style="font-size: 16px;"><strong><span style="color: #ff0000;">效果图</span></strong></span>
<span style="font-size: 16px;">先前我是死活标签hover的设置内容顶不到下边框的最左边,设置完代码后就可以了</span>
<br><br>

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.

The 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.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML 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.

HTML 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.


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