:empty

Selector for elements that are empty (contain no text or other elements).

:only-of-type

Structural pseudo-class, E:only-of-type an E element that is the only sibling of its type for the parent.

There will be no other elements of the same type in the same parent.

See also:

:only-child

Structural pseudo-class, E:only-child an E element, that is the only child of its parent.
Selects elements that have no siblings.

See also:

:last-of-type

Structural pseudo-class, E:last-of-type an E element, last sibling of its type.

See also:

:first-of-type

Structural pseudo-class, E:first-of-type an E element that is the first sibling of its type.

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