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: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 Juli 2015.
* Some parts of this feature may have varying levels of support.
Die:only-childCSS-Pseudoklasse repräsentiert ein Element ohne Geschwister. Dies entspricht:first-child:last-child oder:nth-child(1):nth-last-child(1), jedoch mit einer geringeren Spezifität.
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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 { /* ... */}Beispiele
Einfaches Beispiel
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;}Ergebnis
Ein Listenbeispiel
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;}Ergebnis
Spezifikationen
| Specification |
|---|
| Selectors Level 4 # only-child-pseudo |