Which Do You Recommend Or Use? Class Or Id

[remrow]

What is the Difference between Class and ID?We can use the css styles from both of them but why are they different??

[Synook]

IDs can only be used once in a document, and are therefore useful for other things such as for semantic purposes and for identification when scripting. Classes can be used multiple times.

[jeffman]

Use an id to select a unique item. Perhaps your page has exactly one div called "wrapper" that contains all the other page elements. Most designers would use an id selector.Often you define a class of elements, but one element of the class needs to have something different. Like maybe your header element and footer element have 8-10 CSS properties in common. Define them as a class. Now imagine the footer has a different height. That one different property can be defined using an id selector. The footer tag would reference both the id and the class.

[Synook]

You can also reference multiple classes to apply to an element simply by space-delimiting them:

<element class="class1 class2 class3">