css - :first-child not working as expected

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css - :first-child not working as expected

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

css - :first-child not working as expected

I'm trying to select the first h1 inside a div with a class called detail_container. It works if h1 is the first element within this div, but if it comes after this ul it won't work.

<style type="text/css">
.detail_container h1:first-child
{
color:blue;
} 
</style>
</head>
<body>
<div class="detail_container">
    <ul>
    <li></li>
    <li></li>
    </ul>
    <h1>First H1</h1>
    <h1>Second H1</h1>
</div>
</body>
</html>

I was under the impression that the CSS I have will select the first h1 no matter where it is in this div. How can I make it work?

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1 Reply

深蓝 · Answer 1 · 2021-10-16T22:13:20+0000

The h1:first-child selector means

Select the first child of its parent
if and only if it's an h1 element.

The :first-child of the container here is the ul, and as such cannot satisfy h1:first-child.

There is CSS3's :first-of-type for your case:

.detail_container h1:first-of-type
{
    color: blue;
}

But with browser compatibility woes and whatnot, you're better off giving the first h1 a class, then targeting that class:

.detail_container h1.first
{
    color: blue;
}

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