几个知识点：
HTML 指的是超文本标记语言 (Hyper Text Markup Language)
HTML框架结构：
此处为标签内容
HTML属性：
class=“XXX” :元素类名，CSS定位用
id=“XXX” :元素id，CSS定位用
style=“XXX”:定于元素颜色、是否居中、粗细、边界等
title=“XXX”：鼠标悬停时提示信息
Alt=“XXX”:图片加载错误提示信息
HTML常用标签：
文字内容
:标题居中显示 :图片显示标签
一些独立标签：
:换行
:创建水平线
：注释
显示空格（一种HTML实体符号）
此处可嵌套其他标签:内联元素，不换行
无序列表：
- 第一项
- 第二项
有序列表：
- 第一项
- 第二项
表格：
| 跨行 | row 1, cell 1 | row 1, cell 2 |
| row 2, cell 1 | row 2, cell 2 |
运行样式如下：
表格的一些属性：
表单：
表单是一个包含表单元素的区域，表单元素是允许用户在表单中（比如：文本域、下拉列表、单选框、复选框等等）输入信息的元素
：表单标签:文本域，可输入文字
:输入框元素
:单选按钮元素
：复选按钮
：按钮
：提交按钮
HTML一些高级特性：
框架，将屏幕分为两半，分别填充两个页面：内联框架，将一个页面内联
:外部文件引入，放在head标签内
:定义关键字、文档描述，位于文档head之内
<script></script>：插入script语句
HTML完整例子如下：
<html><head> <link rel="stylesheet" type="text/css" href="theme.css" /> <meta name="description" content="Free Web tutorials on HTML, CSS, XML" /> <meta name="keywords" content="HTML, CSS, XML" /> <base href="https://www.baidu.com/" /> <base target="_blank" /></head> <body> <h1 id="标题">标题1</h1> <p style="font-size:10px" >黄色段落</p> <a href="https://www.baidu.com/" title="这是链接">百度</a> <img src="/static/imghwm/default1.png" data-src="./picture.jpg" class="lazy" alt="图片加载错误"/> <div class="news"> <h2 id="News-headline">News headline 1</h2> <p>some text. some text. some text...</p> ... </div> <span>提示：</span> <table border="1"> <tr> <td rowspan="2">跨行</td> <td>row 1, cell 1</td> <td>row 1, cell 2</td> </tr> <tr> <td>row 2, cell 1</td> <td>row 2, cell 2</td> </tr> </table> <ul> <li>第一项</li> <li>第二项</li> </ul> <ol> <li>第一项</li> <li>第二项</li> </ol> <form name="input" action="html_form_action.asp" method="get"> <textarea rows="10" cols="5">文本域</textarea> 姓名：<input type="text" name="firstname"/> <input type="radio" name="sex"/>男性 <input type="checkbox" name="car" />我有汽车 <button type="button">Click Me!</button> <select name="cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="fiat" selected="selected">Fiat</option> <option value="audi">Audi</option> </select> <input type="submit" value="Submit" /> </form> <frameset cols="75%,25%"> <frame src="./frame_a.htm"> <frame src="./frame_b.htm"> </frameset> <iframe src="https://www.baidu.com/"></iframe> </body></html>
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