Question

#content { padding-top: 13px; *padding-top: 0; }

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My Question is, what does the * do in this example?

It’s from the source code on apple.com/uk website

Answer 1

My Question is, what does the * do in
this example?

It is a CSS hack used to target IE6 and IE7.

#content {
    padding-top: 13px; /* for standard-compliant browsers */
    *padding-top: 0; /* for IE6 and IE7 */
}

Note: It is bad idea to go for CSS hacks. The better approach to target IE is to use IE conditional comments.