1.2, note: & lt;-text-& gt;
1.3, label attribute (name): "
2、整体页面设置
Doctype:告诉浏览器使用什么html规范来解析html。现在使用
Meta:提供有关页面的元信息,例:页面编码、刷新等.
<meta http-equiv="Refresh" CONTENT="2"> <!--刷新--> <meta http-equiv="Refresh" content="2 ;url=http://www.baidu.com"/> <!--跳转--> <meta charset="UTF-8"> <!--设置编码-->
关键字和描述:
<!--关键字(用于在百度中搜索关键字)--> < meta name="keywords" content="你好,博客园,飞机" > <!--描述--> < meta name="keywords" content="你好欢迎你,你也可以来博客园" >
2、HTML中头部(head)的应用
2.1网页名标签
Title:网页头部信息
<title>Titletitle></title>
2.2引用标签:
Link:引用外部资源
<link rel="stylesheet" type="text/css" href="css/com.css"> <!--CSS--> <link rel="shortcut icon" href="i_name%20(1).jpg"> <!--图片-->
2.3样式标签
Style:引用页面中的样式
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>我的样式</title> <style> .color{ background-color: black; color: aliceblue; } </style> </head> <body> <!--最常使用且可重复使用--> <div class="color">引用样式</div> <div class="color">不错</div> <div class="color">还是这个样式</div> </body> </html>
2.4脚本标签(后续更新)
3、HTML中主体(body)的应用
2.1标签分为2类(对写CSS样式有用):
块级标签:p、fieldset、h1、hr、p、ol、ul.
内联标签:a、img、lable、span、select、input.
内联标签和块级标签的区别:内联是根据内容有多少就占多少,快级标签是不管多少都会占一行。
2.2常用标签应用:
表单中的标签:form、input、select、lable、textarea
用于格式的标签:
、
、
列表标签:ul、li、ol、dl、dt、dd
表格标签:table(、
、布局标签:div、span
引用、跳转外部标签:a(文字跳转)、meta(页面跳转)、link(引用外部资源)
2.3各种符号:
网址查看:http://www.cnblogs.com/webd/archive/2010/04/16/1713298.html 例:<a >
2.4标签的应用(id可以在任何标签内且唯一):
1、Div:p用于布局
<body> <div> <div name="upper"> <div name="top"> </div> <div upper_nav> </div> </div> <div name="middle"> </div> <div name="lower"> </div> </div> </body>
2、a:引用和跳转
(1)、超链接
<!--超链接--> <a href="http://www.baidu.com">本页面跳转百度</a> <a href="http://www.baidu.com" target="_blank">新页面跳转百度</a>
(2)、锚:定位到id的位置,id位置将会在页面的顶部。id不能重复,可以不写id。
<!--锚--> <a>1章</a> <a>2章</a> <div>1章内容</div> <div>2章内容</div>
3、p:是段落标签,每一个p标签后都会被认为是段落。
<!--p段落标签--> <p>dddddddddddddddddd<br> </p> <p>dddddddddddddddddd</p>
4、H:h1到h6是从大到小的的字号。
<!--H标签--> <h1 id="a">a</h1> <h2 id="a">a</h2> <h3 id="a">a</h3> <h4 id="a">a</h4> <h5 id="a">a</h5> <h6 id="a">a</h6>
5、列表标签:
<!--无序列表(没有排列限制可以随意加li):-->
- 无序无序
- 无序无序
- 有序有序
- 有序有序
- 北京
- 海淀区
- 朝阳区
- 重庆
- 万州区
- 南岸区
6、Lable标签:用于鼠标点击文字后跳到文本框中
<!--label标签--> <div> <label> 姓名: <input> </label> <label> 婚否: <input> </label> </div>
7、表格:
7.1、新建表格:
表格由
标签定义)字母 td 指表格数据(table data,第一行标题行则通常用 | 来显示。即数据单元格的内容。数据单元格可以包含文本、图片、列表、段落、表单、水平线、表格等等。<!--新建表格:--> <table border="1"> <!--border为显示边框--> <thead> <tr> <th >第一列</th> <th>第二列</th> <th>第三列</th> </tr> </thead> <tbody> <tr> <td>内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> <tr> <td>内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> <tr> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> </tbody> </table> 7.2、表格合并: 使用colspan(横向合并)和rowspan(纵向合并)合并表格 (1)横向合并 原图如下: 代码: <table border="1"> <thead> <tr> <th colspan="2">第一列</th> <th>第二列</th> <th>第三列</th> </tr> </thead> <tbody> <tr> <td>内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> <tr> <td>内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> <tr> <td>内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> </tbody> </table> 执行代码后: (2)纵向合并 原图如下: 代码: <table border="1"> <thead> <tr> <th >第一列</th> <th>第二列</th> <th>第三列</th> <th>第四列</th> </tr> </thead> <tbody> <tr> <td>内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> <tr> <td rowspan="2">内容1</td> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> <tr> <td>内容2</td> <td>内容3</td> <td>内容4</td> </tr> </tbody> </table> 执行代码后: 8、ifname标签:一般用来包含网站 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>我的百度</title> </head> <body> <h1 id="我的百度">我的百度</h1> <iframe style="width: 100%;height: 2000px"src=" </body> </html> 9、表单标签: Form标签:用于为用户输入创建 HTML 表单 Input标签:用于搜集用户信息 intup标签中的type属性: |
---|

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.

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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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