:only-child
Baseline Widely available *
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
* Some parts of this feature may have varying levels of support.
The :only-child CSS pseudo-class represents an element without any siblings. This is the same as :first-child:last-child or :nth-child(1):nth-last-child(1), but with a lower specificity.
Try it
li:only-child { color: fuchsia; } b:only-child { text-decoration: underline; } <p>Stars expected to attend:</p> <ol> <li>Robert Downey, Jr.</li> </ol> <p>Stars yet to confirm:</p> <ol> <li>Scarlett Johansson</li> <li>Samuel L. Jackson</li> <li>Chris Pratt</li> </ol> <p>The ceremony is going to be held in <b>The Dolby Theatre</b>.</p> Syntax
css
:only-child { /* ... */ } Examples
Basic example
HTML
html
<div> <div>I am an only child.</div> </div> <div> <div>I am the 1st sibling.</div> <div>I am the 2nd sibling.</div> <div> I am the 3rd sibling, <div>but this is an only child.</div> </div> </div> CSS
css
div:only-child { color: red; } div { display: inline-block; margin: 6px; outline: 1px solid; } Result
A list example
HTML
html
<ol> <li> First <ul> <li>This list has just one element.</li> </ul> </li> <li> Second <ul> <li>This list has three elements.</li> <li>This list has three elements.</li> <li>This list has three elements.</li> </ul> </li> </ol> CSS
css
li li { list-style-type: disc; } li:only-child { color: red; list-style-type: square; } Result
Specifications
| Specification |
|---|
| Selectors Level 4 # only-child-pseudo |
Browser compatibility
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