trycss_sel_firstchild 在线代码实例

 <p>This paragraph is the first child of its parent (body).</p>

<h1>Welcome to My Homepage</h1>
<p>This paragraph is not the first child of its parent.</p>

<div>
<p>This paragraph is the first child of its parent (div).</p>
<p>This paragraph is not the first child of its parent.</p>
</div>

<p><b>注意:</b> :first-child作用于 IE8以及更早版本的浏览器, DOCTYPE必须已经声明.</p>