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| The Difference Between Class and ID in CSS |
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| Frequently while spying on others' CSS files (it's the best way to learn – really!) I'll notice a distinct difference between the frequency at which they use ID selectors versus Class selectors. I've always leaned toward using class over id in my CSS, but never for a good reason. Today I decided to look up the difference between class and id and learned quite a bit in the process. Both Evrsoft and css-discuss provide very useful information on the subject, and they both distinguish the difference between class and id as follows: The key thing to know is that IDs identify a specific element and therefore must be unique on the page – you can only use a specific ID once per document. Many browsers do not enforce this rule but it is a basic rule of HTML/XHTML and should be observed. Classes mark elements as members of a group and can be used multiple times, so if you want to define a style which will be applied to multiple elements you should use a class instead. As it turns out, I've probably been better off all along by sticking to my class over id mentality. However, it's good to know that id has a specific purpose. Hopefully now I'll be able to use both selectors correctly when they are appropriate. |