代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.one{
/* tac */
text-align: center;
/* ti */
/* 2em表示首行缩进2个大小 */
text-indent: 2em;
/* ti2em */
text-indent: 2em;
/* w */
width: 200px;
/* td */
/* a标签没有下划线 */
text-decoration: none;
}
</style>
</head>
<body>
<!-- form>input -->
<form action="">
<input type="test" value="此地无银三百两">
</form>
<!-- .dimo -->
<div class="dimo">
</div>
<!-- p.demo -->
<p class="demo">
</p>
<!-- p#deim -->
<p id="deim">
</p>
<!-- div*5 -->
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<!--父子级 ul>li -->
<ul>
<li></li>
</ul>
<!-- 兄弟级 div+p -->
<div></div>
<p></p>
<!-- 父子级 p>a -->
<p><a href=""></a></p>
<!-- ul>li#heam -->
<ul>
<li id="heam"></li>
</ul>
<!-- div+p -->
<div></div>
<p></p>
<!-- p.one -->
<p class="one"></p>
<!-- p#one -->
<p id="one"></p>
<!-- .demo$*5 -->
<div class="demo1"></div>
<div class="demo2"></div>
<div class="demo3"></div>
<div class="demo4"></div>
<div class="demo5"></div>
<!-- p#demo$*5 -->
<p id="demo1"></p>
<p id="demo2"></p>
<p id="demo3"></p>
<p id="demo4"></p>
<p id="demo5"></p>
<!-- div{}*5 -->
<!-- div{我家狗吭个声}*5 -->
<div>我家狗吭个声</div>
<div>我家狗吭个声</div>
<div>我家狗吭个声</div>
<div>我家狗吭个声</div>
<div>我家狗吭个声</div>
<!-- div{$}*5 -->
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
<div>5</div>
</body>
</html>