CSS参考手册
选择 | Selectors
:empty
该:empty
伪类代表没有子节点的所有元素。这里只考虑元素节点和文本(包括空格)。注释或处理指令不影响元素是否被认为是空的。
/* Selects any <div> that contains no content */
div:empty {
background: lime;
}
语法
:empty
实例
body {
display: flex;
justify-content: space-around;
}
.box {
background: red;
height: 100px;
width: 100px;
}
.box:empty {
background: lime;
}
<div class="box"><!-- I will be lime --></div>
<div class="box">I will be red</div>
<div class="box">
<!-- I will be red because of the whitespace around this comment -->
</div>
规范
Specification |
Status |
Comment |
---|---|---|
Selectors Level 4The definition of ':empty' in that specification. |
Working Draft |
No change |
Selectors Level 3The definition of ':empty' in that specification. |
Recommendation |
Initial definition |
浏览器兼容性
Feature |
Chrome |
Edge |
Firefox (Gecko) |
Internet Explorer |
Opera |
Safari |
---|---|---|---|---|---|---|
Basic support |
1.0 |
(Yes) |
1.0 (1.7 or earlier) |
9.0 |
9.5 |
3.1 |
Feature |
Android |
Edge |
Firefox Mobile (Gecko) |
IE Mobile |
Opera Mobile |
Safari Mobile |
---|---|---|---|---|---|---|
Basic support |
2.1 |
(Yes) |
1.0 (1) |
9.5 |
10.0 |
3.1 |
选择 | Selectors相关
层叠样式表( Cascading Style Sheets )是一种用来表现 HTML 或 XML 等文件样式的计算机语言。CSS 不仅可以静态地修饰网页,还可以配合各种脚本语言动态地对网页各元素进行格式化。