:only-child
Quick Summary for :only-child
: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.
Code Usage for :only-child
/* Selects each <p>, but only if it is the */ /* only child of its parent */ p:only-child { background-color: lime; } More Details for :only-child
:only-child
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.
Syntax
:only-child
Examples
Basic example
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> div:only-child { color: red; } div { display: inline-block; margin: 6px; outline: 1px solid; } A list example
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> li li { list-style-type: disc; } li:only-child { color: red; list-style-type: square; } Specifications
| Specification |
|---|
| Selectors Level 4 # only-child-pseudo |
See also
:only-of-type :first-child :last-child :nth-child Last modified: Jan 20, 2022, by MDN contributors
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986
