What does "+" do in css?

Question

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What does + mean in CSS?

I don't understand what the "+" does in this context.

.test ul li:hover + li a img {
  width:60px;
  height:60px;
}

Answer 1

It means any li immediatly following a li:hover.

See CSS Selectors on W3.

E + F: Matches any F element immediately preceded by a sibling element E.

And:

Thus, the following rule states that when a P element immediately follows a MATH element, it should not be indented:

math + p { text-indent: 0 }