CSS DIV(box)_html/css_WEB-ITnose
The following is a quoted fragment:
<style type="text/css"> <!-- * { margin: 0px; padding: 0px; } body { font-family: Arial, Helvetica, sans-serif; font-size: 12px; margin: 0px auto; height: auto; width: 760px; border: 1px solid #006633; } #header { height: 100px; width: 760px; background-image: url(headPic.gif); background-repeat: no-repeat; margin:0px 0px 3px 0px; } #nav { height: 25px; width: 760px; font-size: 14px; list-style-type: none; } #nav li { float:left; } #nav li a{ color:#000000; text-decoration:none; padding-top:4px; display:block; width:97px; height:22px; text-align:center; background-color: #009966; margin-left:2px; } #nav li a:hover{ background-color:#006633; color:#FFFFFF; } #content { height:auto; width: 740px; line-height: 1.5em; padding: 10px; } #content p { text-indent: 2em; } #content h5 { font-size: 16px; margin: 10px; } #footer { height: 50px; width: 740px; line-height: 2em; text-align: center; background-color: #009966; padding: 10px; } --> </style>
The structure code is like this:
The following is a quotation fragment:
<body> <p id="header"></p> <ul id="nav"> <li><a href="#">首 页</a></li> <li><a href="#">文 章</a></li> <li><a href="#">相册</a></li> <li><a href="#">Blog</a></li> <li><a href="#">论 坛</a></li> <li><a href="#">帮助</a></li> </ul> <p id="content"> <h5 id="前言">前言</h5> <p>第一段内容</p> <h5 id="理解CSS盒子模式">理解CSS盒子模式</h5> css <p>第二段内容</p> </p> <p id="footer"> <p>关于华升 | 广告服务 | 华升招聘 | 客服中心 | Q Q留言 | 网站管理 | 会员登录 | 购物车</p> <p>Copyright ?2006 - 2008 Tang Guohui. All Rights Reserved</p> </p> </body>
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The roles of HTML, CSS and JavaScript in web development are: 1. HTML is used to build web page structure; 2. CSS is used to beautify the appearance of web pages; 3. JavaScript is used to achieve dynamic interaction. Through tags, styles and scripts, these three together build the core functions of modern web pages.

Setting the lang attributes of a tag is a key step in optimizing web accessibility and SEO. 1) Set the lang attribute in the tag, such as. 2) In multilingual content, set lang attributes for different language parts, such as. 3) Use language codes that comply with ISO639-1 standards, such as "en", "fr", "zh", etc. Correctly setting the lang attribute can improve the accessibility of web pages and search engine rankings.

HTMLattributesareessentialforenhancingwebelements'functionalityandappearance.Theyaddinformationtodefinebehavior,appearance,andinteraction,makingwebsitesinteractive,responsive,andvisuallyappealing.Attributeslikesrc,href,class,type,anddisabledtransform

TocreatealistinHTML,useforunorderedlistsandfororderedlists:1)Forunorderedlists,wrapitemsinanduseforeachitem,renderingasabulletedlist.2)Fororderedlists,useandfornumberedlists,customizablewiththetypeattributefordifferentnumberingstyles.

HTML is used to build websites with clear structure. 1) Use tags such as, and define the website structure. 2) Examples show the structure of blogs and e-commerce websites. 3) Avoid common mistakes such as incorrect label nesting. 4) Optimize performance by reducing HTTP requests and using semantic tags.

ToinsertanimageintoanHTMLpage,usethetagwithsrcandaltattributes.1)UsealttextforaccessibilityandSEO.2)Implementsrcsetforresponsiveimages.3)Applylazyloadingwithloading="lazy"tooptimizeperformance.4)OptimizeimagesusingtoolslikeImageOptimtoreduc

The core purpose of HTML is to enable the browser to understand and display web content. 1. HTML defines the web page structure and content through tags, such as, to, etc. 2. HTML5 enhances multimedia support and introduces and tags. 3.HTML provides form elements to support user interaction. 4. Optimizing HTML code can improve web page performance, such as reducing HTTP requests and compressing HTML.

HTMLtagsareessentialforwebdevelopmentastheystructureandenhancewebpages.1)Theydefinelayout,semantics,andinteractivity.2)SemantictagsimproveaccessibilityandSEO.3)Properuseoftagscanoptimizeperformanceandensurecross-browsercompatibility.


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