我理解创建类标签的一般概念，例如 .center 或 p.center，但是做类似“p.center p”这样的事情是什么意思？我在使用 CSS 创建图片库时看到了这样的示例。 div.img img 是什么意思？非常感谢!
<html>
<head>
<style type="text/css">
div.img
{
margin: 2px;
}
div.img img
{
display: inline;
margin: 3px;
border: 1px solid #ffffff;
}
div.img a:hover img {border: 1px solid #0000ff;}
</style>
</head>
<body>
<div class="img">
<a target="_blank" href="klematis4_big.htm"><img src="klematis4_small.jpg" alt="Klematis" width="110" height="90" /></a>
</div>
</body>
</html>
最佳答案
到目前为止给出的所有答案都是正确的，但也许也解释一下它不是什么会有所帮助。
同时 div.img img { }会影响img <div class="img"> 中包含的元素元素，这里有一些它不会影响的元素:
<body>
<img src="klematis4_small.jpg" alt="Klematis"><br>
This image is not contained in a div, therefore it cannot possibly be
contained in a div of the class "img" and is therefore unaffected.
<div>
<img src="klematis4_small.jpg" alt="Klematis"><br>
This img element is in a div, but the div is not of the class "img",
so the img element is unaffected.
</div>
<div id="img">
<img src="klematis4_small.jpg" alt="Klematis"><br>
This img is contained within a div that has an ID of "img", but it is
also not of the class "img" and is therefore unaffected.
</div>
</body>
关于css - 标签 "div.img img"是什么意思？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6405889/