例子：
<html>
<head>
<style type="text/css">
ul.none{list-style-type:none}
ul.circle {list-style-type:circle}
ul.square {list-style-type:square}
ol.upper-roman {list-style-type:upper-roman}
ol.lower-alpha {list-style-type:lower-alpha}
</style>
</head>
<body>
<p>list-style-type none:</p>
<ul class="none">
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ul>
<p>list-style-type circle:</p>
<ul class="circle">
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ul>
<p>list-style-type square:</p>
<ul class="square">
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ul>
<p>Type upper-roman:</p>
<ol class="upper-roman">
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ol>
<p>list-style-type lower-alpha:</p>
<ol class="lower-alpha">
<li>Coffee</li>
<li>Tea</li>
<li>Coca Cola</li>
</ol>
</body>
</html>
CSS 有序或者无序列表的前面的标记 list-style-type 属性
原文：https://www.cnblogs.com/yuer20180726/p/11005561.html