Difference between h1 em and h1 > em

What is the difference between these two CSS statements: h1 em { color:#ddd; } and h1 > em { color:#ddd; } As far as I can tell they do exactly the same thing (though according to what I've read at W3C in the first case em is considered a 'descendant' where as in the second it is considered a 'child', though I have no idea how that is actually different). Can anyone explain how these are different and why you would choose to use one syntax over the other. I've always just used the first method, but every now and again I run across the second style in other people's code.

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