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The neighboring sibling selector uses the plus sign (+), which is the neighboring sibling combinator (Adjacent sibling combinator).

Note: like the child combinator, there can be a blank character next to the neighboring sibling combinator.

Take a look at the following document tree fragment:

List item 1 List item 2 List item 3 List item 1 List item 2 List item 3

In the above snippet, the div element contains two lists: an unordered list and an ordered list, each containing three list items. The two lists are neighboring brothers, and the list items themselves are neighboring brothers. However, the list items in the first list and the list items in the second list are not adjacent brothers, because the two sets of list items do not belong to the same parent element (cousins at most).

Keep in mind that you can only select the second element of two neighboring brothers with a combination. Look at the selector below:

Li + li {font-weight:bold;}

The above selector only changes the second and third list items in the list to bold. The first list item is not affected.

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