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.
/* Selects each <p>, but only if it is the */ /* only child of its parent */ p:only-child { background-color: lime; }
Note: As originally defined, the selected element had to have a parent. Beginning with Selectors Level 4, this is no longer required.
:only-child
<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>
div:only-child { color: red; } div { display: inline-block; margin: 6px; outline: 1px solid; }
<ol> <li>First <ul> <li>This list has just one element. </ul> </li> <li>Second <ul> <li>This list has three elements. <li>This list has three elements. <li>This list has three elements. </ul> </li> </ol>
li li { list-style-type: disc; } li:only-child { color: red; list-style-type: square; }
Specification | Status | Comment |
---|---|---|
Selectors Level 4 The definition of ':only-child' in that specification. | Working Draft | Matching elements are not required to have a parent. |
Selectors Level 3 The definition of ':only-child' in that specification. | Recommendation | Initial definition. |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 2 | Yes | 1.5 | 9 | 9.5 | 3.1 |
Matches elements with no parent | 57 | ? | 52 | ? | 44 | ? |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | Yes | Yes | Yes | 4 | 10 | 3.1 | Yes |
Matches elements with no parent | 57 | 57 | ? | 52 | 44 | ? | 7.0 |
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https://developer.mozilla.org/en-US/docs/Web/CSS/:only-child