Class or ID on Body Tag

Question

I\'ve been applying an ID to the body tag of my HTML documents lately to allow greater CSS control (#9). Recently the though occurred to me that I could do exactly the same

Answer 1

You can (read: should) only use the id on the body tag.

ID = single use per page

Class = multiple uses

1 Body tag = 1 id tag. This can be the same on different pages. Essentially, using the class tag is probably overkill for this purpose.