When we need to select the immediate
next element, we use the + character
like this:
h1 + p will select a p
element that immediately follows
an h1 element. The two elements
should be on the same nesting level.
This means that they should both
be the direct child of the same
parent.
Only the p element that
immediately follows
an h1 is selected. No other p elements are selected.
Try adding a span element between
h1 and p in the HTML
markup above. You'll see that now
no element will be selected.
These elements that are
children of a common parent and
are at the same nested level
are called siblings.