I'd like to know how to write a css block that applies to either multiple ids or multiple classes : Something like: .class1, .class2 { ... } or #id1, #id2 { ... } I'd like to know how to do both cases (which hopefully are cross browser compliant). Thanks. Update: To make it more interesting, is this valid too? #id tr, #id2 tr { } ?

css multiple class / id selectors?

I'd like to know how to write a css block that applies to either multiple ids or multiple classes:

Something like:

.class1, .class2 {
 ...
}

#id1, #id2 {
 ...
}

I'd like to know how to do both cases (which hopefully are cross browser compliant). Thanks.

Update: To make it more interesting, is this valid too?

#id tr, #id2 tr {

}