css - IE9突然CSS大小写敏感

Question

由于某种原因，CSS 在 IE9 中突然变得区分大小写。我已经在其他人的计算机上尝试过，并且该站点在 IE9 中显示良好，但在我的机器上它不会显示 CSS，除非情况正确。

我可以将 IE 设置更改为怪癖模式，它会起作用，但它不能解释奇怪的行为。

我尝试将所有 IE 的设置重置为默认值，清除缓存，但无法重新安装。

Answer 1

Are you in standards mode? Historically IE has been case-insensitive for the class and ID selectors, but I understand IE9 is case-sensitive when in standards mode.

CSS properties and most values are case-insensitive, exceptions being url() where the webserver serving up images might have case-sensitive filenames.

CSS selectors are case-insensitive except for parts outside of CSS, such as #id and .class selectors. For more information see this question: Are CSS selectors case-sensitive?