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The first two lines of w3.css

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Apologies for asking what must be a naive question, but the effect this is having is actually quite important to me.


The second line of w3.css reads



I get everything except the * after the first } "-box}* ". No-where can I work out what this is supposed to do. The first element styled is html, the second and third are before and after of everything *, but what is that first * doing please?
Thanks in advance.
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The asterisk selects all elements, the comma is used to apply multiple selectors to the same set of rules. When properly indented the code should look like this:

html {

*, *:before, *:after {
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