<body>
<div class="wrap">
<div>我是div1</div>
<span>我是span1</span>
<span>我是span2</span>
<div>我是div2</div>
<i>我是i1</i>
<i>我是i2</i>
<strong>我是strong1</strong>
<em>我是em1</em>
<div>我是div3</div>
<span>我是span3</span>
</div>
</body>
body>div {
margin: 0px 0 24px 0;
border: 1px solid #000;
}
/* 选中不是每个区分类型的第一个元素 */
.wrap :not(:first-of-type) {
background-color: red;
}