CSS 选择器区分大小写吗?

Are CSS selectors case-sensitive?(CSS 选择器区分大小写吗?)

问题描述

我最近更新了一个 CMS 网站，一个标签导航插件插入了以下标记:

I was recently updating a CMS site and a tab-navigation plugin had inserted the following markup:

<li id="News_tab">...

我的 CSS 选择器总是用小写字母编写，所以当我尝试使用 #news_tab 对其进行样式设置时，它不适用，但 #News_tab 有效.

I've always written my CSS selectors in lowercase so when I tried to style this with #news_tab, it wouldn't apply, but #News_tab worked.

这么多年过去了，我很惊讶我以前没有遇到过这种情况，所以我一直认为 CSS 是不区分大小写的.CSS 是否一直是区分大小写的，由于我一致的代码风格，我只是没有注意到?

After all these years I'm surprised that I haven't run into this before, so I've always been under the impression that CSS was case-insensitive. Has CSS always been case-sensitive and I just haven't noticed thanks to my consistent code style?

推荐答案

CSS 本身不区分大小写，但 HTML 中的选择器(class 和 id)区分大小写:

CSS itself is case insensitive, but selectors from HTML (class and id) are case sensitive:

关于区分大小写的 CSS 建议

HTML 推荐，id 属性(注意[CS])

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