《图解HTML》第三节 HTML简介

由前面两个章节了解到,浏览器如同一个加工厂,在这个加工厂里面,有HTML、CSS、JS三大零件,然后浏览器将这些零件组装成一张张美丽的网页。 HTML负责骨架,CSS负责样式,JS负责行为。 那么HTML是什么呢? HTML是Hyper Text Markup Language(超文本标记语言)的简写,是一种标记语言,而不是一种编程语言,是网页制作所必备的。超文本,本质也是文本。 自HTML3.2之后,由W3C推荐标准,定义了多种类型的元素(div,p...)和众多类型的属性值(id,name...)。 HTML文档基本结构 HTML基本结构图 HTML文档基本结构示例 Document
Hello World
文件类型描述(DOCTYPE) 为了说明文档使用的超文本标记语言标准,所有超文本标记语言文档应该以“文件类型声明”(外语全称加缩写)开头,引用一个文件类型描述或者必要情况下自定义一个文件类型描述。举例来说: html5: html4: 根标签(html) html文档的最高节点标签。 元数据(meta) 元数据(Metadata)是数据的数据信息。 标签提供了 HTML 文档的元数据。元数据不会显示在客户端,但是会被浏览器解析。 META元素通常用于指定网页的描述,关键词,文件的最后修改时间,作者及其他元数据。 元数据可以被使用浏览器(如何显示内容或重新加载页面),搜索引擎(关键词),或其他 Web 服务调用。 网页标题(title) title是网页的标题元素包含在head中例如:百度一下你就知道在网页上方的标签中显示:百度一下你就知道,相当于一个关键字搜索引擎可以通过关键字查找到此页面。 主题部分(body) body元素是网页的主体部分,网页的内容都写在里面,包括文本,图像,表单,音频,视频等其他内容。 我们编写网页的头部在head里编写,主体是在body内编写。在head里面可编写的内容大多是固定的,而在主体中的标签却是繁多且灵活组合使用的。 带5标识的,是HTML5新增的标签: HTML标签 标签的分类 如此多的标签,看得眼花缭乱,可以适当的将它们分分类。例如单标签/双标签,块级元素/内联元素,或者根据功能分类。 单标签/双标签 单标签:

双标签: 除去以上的单标签都是双标签 块级元素/内联元素 块级元素定义 总是在新行上开始; 高度,行高以及外边距和内边距都可控制; 宽度缺省是它的容器的100%,除非设定一个宽度。 它可以容纳内联元素和其他块元素 内联元素定义 和其他元素都在一行上; 高,行高及外边距和内边距不可改变; 宽度就是它的文字或图片的宽度,不可改变 内联元素只能容纳文本或者其他内联元素 块级元素有哪些
//定义地址 //定义表格标题
//定义列表中定义条目
//定义文档中的分区或节
//定义列表
//定义列表中的项目
//定义一个框架集
//创建 HTML 表单

//定义最大的标题

// 定义副标题

//定义标题

//定义标题

//定义标题
//定义最小的标题
//创建一条水平线 //元素为 fieldset 元素定义标题
  • //标签定义列表项目 //为那些不支持框架的浏览器显示文本,于 frameset 元素内部 <noscript> //定义在脚本未被执行时的替代内容 <ol> //定义有序列表 <ul> //定义无序列表 <p> //标签定义段落 <pre> //定义预格式化的文本 <table> //标签定义 HTML 表格 <tbody> //标签表格主体(正文) <td> //表格中的标准单元格 <tfoot> //定义表格的页脚(脚注或表注) <th> //定义表头单元格 <thead> //标签定义表格的表头 <tr> //定义表格中的行 内联元素有哪些 <a> //标签可定义锚 <abbr> //表示一个缩写形式 <acronym> //定义只取首字母缩写 <b> //字体加粗 <bdo> //可覆盖默认的文本方向 <big> //大号字体加粗 <br> //换行 <cite> //引用进行定义 <code> // 定义计算机代码文本 <dfn> //定义一个定义项目 <em> //定义为强调的内容 <i> //斜体文本效果 <img> //向网页中嵌入一幅图像 <input> //输入框 <kbd> //定义键盘文本 <label> //标签为 input 元素定义标注(标记) <q> //定义短的引用 <samp> //定义样本文本 <select> // 创建单选或多选菜单 <small> //呈现小号字体效果 <span> //组合文档中的行内元素 <strong> //加粗 <sub> //定义下标文本 <sup> //定义上标文本 <textarea> //多行的文本输入控件 <tt> //打字机或者等宽的文本效果 <var> // 定义变量 根据块级元素/内联元素分类的话,还有一些元素根据内容才能判断元素类型,例如: <button> //按钮 <del> // 定义文档中已被删除的文本 <iframe> //创建包含另外一个文档的内联框架(即行内框架) <ins> //标签定义已经被插入文档中的文本 <map> //客户端图像映射(即热区) <object> //object对象 <script> //客户端脚本 我们可以通过css的display属性对块级元素、行内元素进行转换,也可以设置行内块元素。 行内块元素 1、和其他元素都在一行上; 2、元素的高度、宽度、行高以及顶和底边距都可设置 在下一章节中会根据不同的功能对标签进行划分,且对标签进行详解。 </div></div><div class="post-footer" data-v-8db8d892><!----><div class="copy-desc" data-v-8db8d892><div data-v-8db8d892>本文由作者创作或收集,内容引用如有问题请联系站长处理。</div><div data-v-8db8d892> 转载请注明原文及出处:<a class="quote" href="https://www.dsiab.com/post/2b62031f-a566-422f-8605-61b7a5857e4d" data-v-8db8d892>《图解HTML》第三节 HTML简介</a></div></div></div><div class="postRecommend" style="display:none;" data-v-8db8d892><div class="common-title" data-v-a72f5a0e>推荐阅读 <i class="active-line" data-v-a72f5a0e></i></div><ul><!--[--><!--]--></ul></div><div class="comments" data-v-8db8d892 data-v-f2b74ff7><div class="add-comment" data-v-f2b74ff7><h3 data-v-f2b74ff7>发表评论<span style="color:gray;font-size:1rem;" data-v-f2b74ff7> (审核通过后显示评论):</span></h3><form class="el-form el-form--default el-form--label-right" data-v-f2b74ff7><!--[--><div class="el-form-item is-required asterisk-left el-form-item--label-right" role="group" aria-labelledby="el-id-1024-0" 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\u003Cmeta charset=\"UTF-8\">\n \u003Cmeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n \u003Ctitle>Document\u003C/title>\n\u003C/head>\n\u003Cbody>\n \u003Cdiv>Hello World\u003C/div>\n\u003C/body>\n\u003C/html>\n\n文件类型描述(DOCTYPE)\n为了说明文档使用的超文本标记语言标准,所有超文本标记语言文档应该以“文件类型声明”(外语全称加缩写\u003C!DOCTYPE>)开头,引用一个文件类型描述或者必要情况下自定义一个文件类型描述。举例来说:\nhtml5:\n\u003C!DOCTYPE HTML>\n\nhtml4:\n\u003C!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\"\n \"http://www.w3.org/TR/html4/strict.dtd\">\n\n根标签(html)\nhtml文档的最高节点标签。\n元数据(meta)\n\n元数据(Metadata)是数据的数据信息。\n\u003Cmeta> 标签提供了 HTML 文档的元数据。元数据不会显示在客户端,但是会被浏览器解析。\nMETA元素通常用于指定网页的描述,关键词,文件的最后修改时间,作者及其他元数据。\n元数据可以被使用浏览器(如何显示内容或重新加载页面),搜索引擎(关键词),或其他 Web 服务调用。\n\n网页标题(title)\ntitle是网页的标题元素包含在head中例如:\u003Ctitle>百度一下你就知道\u003C/title>在网页上方的标签中显示:百度一下你就知道,相当于一个关键字搜索引擎可以通过关键字查找到此页面。\n主题部分(body)\nbody元素是网页的主体部分,网页的内容都写在里面,包括文本,图像,表单,音频,视频等其他内容。\n我们编写网页的头部在head里编写,主体是在body内编写。在head里面可编写的内容大多是固定的,而在主体中的标签却是繁多且灵活组合使用的。\n带5标识的,是HTML5新增的标签:\n\n\n\n\n\n\nHTML标签\n\n标签的分类\n如此多的标签,看得眼花缭乱,可以适当的将它们分分类。例如单标签/双标签,块级元素/内联元素,或者根据功能分类。\n单标签/双标签\n单标签:\n\u003Cbr>\u003Chr>\u003Cimg>\u003Cinput>\u003Cparam>\u003Cmeta>\u003Clink>\n\n双标签:\n除去以上的单标签都是双标签\n块级元素/内联元素\n块级元素定义\n\n总是在新行上开始;\n高度,行高以及外边距和内边距都可控制;\n宽度缺省是它的容器的100%,除非设定一个宽度。\n它可以容纳内联元素和其他块元素\n\n内联元素定义\n\n和其他元素都在一行上;\n高,行高及外边距和内边距不可改变;\n宽度就是它的文字或图片的宽度,不可改变\n内联元素只能容纳文本或者其他内联元素\n\n块级元素有哪些\n \u003Caddress>//定义地址 \n \u003Ccaption>//定义表格标题 \n \u003Cdd> //定义列表中定义条目 \n \u003Cdiv> //定义文档中的分区或节 \n \u003Cdl> //定义列表 \n \u003Cdt> //定义列表中的项目 \n \u003Cfieldset> //定义一个框架集 \n \u003Cform> //创建 HTML 表单 \n \u003Ch1> //定义最大的标题\n \u003Ch2> // 定义副标题\n \u003Ch3> //定义标题\n \u003Ch4> //定义标题\n \u003Ch5> //定义标题\n \u003Ch6> //定义最小的标题\n 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