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Selectors/onlyChild

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:only-child

Matches all elements that are the only child of their parent.
If the parent has other child elements, nothing is matched.
Examples:

Finds the button with no siblings in each matched div and modifies look.

$("div button:only-child").text("Alone").css("border", "2px blue solid");

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
  
  <script>
  $(document).ready(function(){
    $("div button:only-child").text("Alone").css("border", "2px blue solid");
  });
  </script>
  <style>
  div { width:100px; height:80px; margin:5px; float:left; background:#b9e }
  </style>
</head>
<body>
  <div>
    <button>Sibling!</button>
    <button>Sibling!</button>
  </div>
  <div>
    <button>Sibling!</button>
  </div>
  <div>
    None
  </div>
  <div>  
    <button>Sibling!</button>
    <button>Sibling!</button>
    <button>Sibling!</button>
  </div>
  <div>
    <button>Sibling!</button>
  </div>
</body>
</html>

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