<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html> <head>
<title>How to Write a Good Report</title>
<style type="text/css">
div.weather strong:first-child {color:red;}
</style>
</head>
<body>
<div class="weather">
It's <strong>very</strong> hot and <strong>incredibly</strong> humid.
</div>
</body> </html>
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为什么只有"非常"是红色,而"令人难以置信"不是因为它们都是"div.weather strong"指定元素的第一个孩子?
因为伪选择器没有按照你的想法做到.
它选择,在您所陈述的示例中,元素的第一个孩子.weather是一个<strong>元素.
所以只有第一个实例匹配.我不能参考规格来支持这个,因为我现在很懒(忙碌的一天......),但我脑子里有这样的想法:
<html>
<div class="weather">
<p><strong>Lorem</strong> ipsum <strong>sit</strong> <em>amet</em> <span><a...>dolor</a><em>yadda yadda yadda</em></span> <a>something</a>, I'm not good at coming up with random text. Sorry...</p>
</html>
Weather
|
+----------------+---------------------+---------------+-------------------+.....
| | | | |
(first-child) (second-child) (third-child) (fourth-child) (fifth-child)
strong strong em span a
|
+-------+--------+
| |
first-child second-child
a em
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我知道,这不是最漂亮的ascii例子,但它是我如何看待它的.
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