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I was recently updating a CMS site and a tab-navigation plugin had inserted the following markup:
<li id="News_tab">... 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.
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?
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Since its inception, CSS has been a weird language from the case perspective, it is case-insensitive by definition, but in reality it is more of a "hybrid": properties and values are case-insensitive, while selectors are (mostly) case-sensitive.
Yes, it is a case sensitive language, which means the identifiers, keywords, variables, and function names must be written with a consistent capitalization of letters.
Note: The id name is case sensitive! Note: The id name must contain at least one character, cannot start with a number, and must not contain whitespaces (spaces, tabs, etc.).
CSS itself is case insensitive, but selectors from HTML (class and id) are case sensitive:
CSS recommendation on case sensitivity
HTML recommendation, id attribute (note the [CS])
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CSS4 (CSS Selector Level 4) adds support for case-insensitive match (ASCII only).
input[value='search' i]
It's the "i" at the end which would do the trick...
Check my other answer for details which browser supports this.
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