I always forget the difference between the grouping selector and the descendant selector.
grouping selector:
h1,h2 {…}
descendant selector:
h1 em {…}
child selector(like descendant selector but only selects the direct children):
h1 > em {…}
Pseudo-class:
a:visited {…}
Pseudo-element:
h1:after {…}
attribute selector:
[title] {…}
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