:only-child
Targets an element that is the ONLY child of its parent. If there are any other elements (even of a different type), it won't match.
Quick example
li:only-child {
/* Styles a list item specially if it's the only one in the list */
list-style: none;
padding: 20px;
}:only-child Browser Support
Widely available Since 2015 96% global usage
This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.
Safe to use without fallbacks.
2+
1.5+
3.1+
12+