Web前端：html常用知识点整理总结（长篇-仔细自用）
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">篇幅有点长，有示例代码<span style="color: black;">晓得</span>标签<span style="color: black;">怎样</span><span style="color: black;">运用</span>，还有标签的语义描述，学习标签先<span style="color: black;">晓得</span>语义再安排放在哪<span style="color: black;">运用</span>，<span style="color: black;">不外</span>页面大部分布局都是div搞定，不讲究SEO优化<span style="color: black;">能够</span>不<span style="color: black;">思虑</span>H5新增的容器标签，<span style="color: black;">不外</span>个人觉得还是最好用，哪个做网站的不<span style="color: black;">期盼</span>自己网站排名好点呢~</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">另一</span>分享一个网站：<a style="color: black;">python自学网</a>，想学python<span style="color: black;">关联</span>的或者python全栈工程师，GUI界面化图形等都<span style="color: black;">能够</span>去<span style="color: black;">认识</span>下，web<span style="color: black;">研发</span><span style="color: black;">亦</span>是有<span style="color: black;">关联</span>课程的。</p>
<h3 style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;">1、</span>HTML文档结构：</h3>
<div style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;"><!DOCTYPE html></span>
<span style="color: black;"><!-- 文档声明，告诉浏览器当前<span style="color: black;">运用</span>的HTML标准是HTML5,<span style="color: black;">必定</span>在<span style="color: black;">第1</span>行 --></span>
<span style="color: black;"><</span><span style="color: black;">html</span> <span style="color: black;">lang</span><span style="color: black;">=</span><span style="color: black;">"en"</span><span style="color: black;">></span>
<span style="color: black;"><!--
</span><span style="color: black;"><html></html>：根标签，告诉浏览器自己是HTML文档给，所有的标签都写在它的里面</span><span style="color: black;"> lang="en"：lang属性，<span style="color: black;">暗示</span>该元素<span style="color: black;">运用</span>的文字是哪一种语言，en英文，zh-CN中文
</span><span style="color: black;"> --></span>
<span style="color: black;"><</span><span style="color: black;">head</span><span style="color: black;">></span>
<span style="color: black;"><!-- <head></head>:文档头，在它里面的内容<span style="color: black;">通常</span>设置网页<span style="color: black;">关联</span>信息，不会被渲染在网页页面上--></span>
<span style="color: black;"><</span><span style="color: black;">meta</span> <span style="color: black;">charset</span><span style="color: black;">=</span><span style="color: black;">"UTF-8"</span> <span style="color: black;">/></span>
<span style="color: black;"><!--
</span><span style="color: black;"> <meta/>：元属性描述，文档的原数据(附加信息),单标签
</span><span style="color: black;"> charset="UTF-8"：字符编码，制定网页内容编码为UTF-8
</span><span style="color: black;"> --></span>
<span style="color: black;"><</span><span style="color: black;">meta</span> <span style="color: black;">http-equiv</span><span style="color: black;">=</span><span style="color: black;">"X-UA-Compatible"</span> <span style="color: black;">content</span><span style="color: black;">=</span><span style="color: black;">"IE=edge"</span> <span style="color: black;">/></span>
<span style="color: black;"><!--
</span><span style="color: black;">http-equiv="X-UA-Compatible" ：文档兼容模式的定义</span><span style="color: black;"> Edge模式告诉IE以最高级 模式渲染文档，<span style="color: black;">亦</span><span style="color: black;">便是</span>任何IE版本都以当前版本所支持的最高级标准模式渲染，避免版本升级<span style="color: black;">导致</span>的影响。
</span><span style="color: black;"> --></span>
<span style="color: black;"><</span><span style="color: black;">meta</span> <span style="color: black;">name</span><span style="color: black;">=</span><span style="color: black;">"viewport"</span> <span style="color: black;">content</span><span style="color: black;">=</span><span style="color: black;">"width=device-width, initial-scale=1.0"</span> <span style="color: black;">/></span>
<span style="color: black;"><!--
</span><span style="color: black;"> 手机端适配，不写手机端页面<span style="color: black;">不消</span>
</span><span style="color: black;"> viewport：用于指定用户<span style="color: black;">是不是</span><span style="color: black;">能够</span>缩放Web页面，并对<span style="color: black;">关联</span>的选项进行设定
</span><span style="color: black;">width或height:指定视区的<span style="color: black;">规律</span>宽度和高度，取值<span style="color: black;">能够</span>是以像素单位的数字，<span style="color: black;">亦</span><span style="color: black;">能够</span>是特殊的标记符号（device-width：视区宽度应为设备的屏幕宽度，device-width同理）</span><span style="color: black;"> initial-scale：设置Web页面的初始缩放比例，值设为1.0则<span style="color: black;">表示</span>未经缩放的Web页面
</span><span style="color: black;"> --></span>
<span style="color: black;"><</span><span style="color: black;">title</span><span style="color: black;">></span>Document<span style="color: black;"></</span><span style="color: black;">title</span><span style="color: black;">></span>
<span style="color: black;"><!-- <title></title>:网页标题--></span>
<span style="color: black;"><</span><span style="color: black;">link</span> <span style="color: black;">rel</span><span style="color: black;">=</span><span style="color: black;">"shortcut icon"</span> <span style="color: black;">href</span><span style="color: black;">=</span><span style="color: black;">"favicon.ico"</span> <span style="color: black;">type</span><span style="color: black;">=</span><span style="color: black;">"image/x-icon"</span><span style="color: black;">></span>
<span style="color: black;"><</span><span style="color: black;">link</span> <span style="color: black;">rel</span><span style="color: black;">=</span><span style="color: black;">"stylesheet"</span> <span style="color: black;">href</span><span style="color: black;">=</span><span style="color: black;">"style.css"</span><span style="color: black;">></span>
<span style="color: black;"><</span><span style="color: black;">script</span> <span style="color: black;">type</span><span style="color: black;">=</span><span style="color: black;">"text/javascript"</span> <span style="color: black;">src</span><span style="color: black;">=</span><span style="color: black;">"index.js"</span><span style="color: black;">></</span><span style="color: black;">script</span><span style="color: black;">></span>
<span style="color: black;"><!-- 页面图标、加载<span style="color: black;">外边</span>的css/js文件......--></span>
<span style="color: black;"></</span><span style="color: black;">head</span><span style="color: black;">></span>
<span style="color: black;"><</span><span style="color: black;">body</span><span style="color: black;">></span>
<span style="color: black;"><!-- <body></body>:写网页的主体，里面放内容标签，如a、p、img、h1~h6等 --></span>
<span style="color: black;"></</span><span style="color: black;">body</span><span style="color: black;">></span>
<span style="color: black;"></</span><span style="color: black;">html</span><span style="color: black;">></span>
</div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">简单文档结构：如下</p>
<div style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;"><!DOCTYPE html></span>
<span style="color: black;"><</span><span style="color: black;">html</span> <span style="color: black;">lang</span><span style="color: black;">=</span><span style="color: black;">"en"</span><span style="color: black;">></span>
<span style="color: black;"><</span><span style="color: black;">head</span><span style="color: black;">></span>
<span style="color: black;"><</span><span style="color: black;">meta</span> <span style="color: black;">charset</span><span style="color: black;">=</span><span style="color: black;">"UTF-8"</span> <span style="color: black;">/></span>
<span style="color: black;"><</span><span style="color: black;">title</span><span style="color: black;">></span>Document<span style="color: black;"></</span><span style="color: black;">title</span><span style="color: black;">></span>
<span style="color: black;"></</span><span style="color: black;">head</span><span style="color: black;">></span>
<span style="color: black;"><</span><span style="color: black;">body</span><span style="color: black;">></</span><span style="color: black;">body</span><span style="color: black;">></span>
<span style="color: black;"></</span><span style="color: black;">html</span><span style="color: black;">></span>
</div>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">保留</span>以上，文件格式为.html<span style="color: black;">便是</span>一个html文件了。</p>
<h3 style="color: black; text-align: left; margin-bottom: 10px;"><span style="color: black;">2、</span>注释、标签、元素、属性</h3>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">注释：快捷键 ctrl+/ ,注释的内容不会被浏览器渲染在页面上，给<span style="color: black;">研发</span>者自己看的 </p>
<h3 style="color: black; text-align: left; margin-bottom: 10px;">1.1标签</h3>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">标签概念：由尖括号“< >”<span style="color: black;">包裹</span>的<span style="color: black;">重要</span>词，<span style="color: black;">通常</span>是成对<span style="color: black;">显现</span>的，标签对中<span style="color: black;">第1</span>个标签是<span style="color: black;">起始</span>标签如<body> ，第二个标签是结束标签如 </body></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">标签格式：</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"> 双标签：<<span style="color: black;">起始</span>标签> 结束标签></p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"> 单（空）标签：<标签名/> (<span style="color: black;">无</span>结束标签)</p>
<p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">标签内容：</p> 双标签，其内容在两个标签中间
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