:header selector

Selects all elements that are headers, like h1, h2, h3 and so on.

Because :header is a jQuery extension and not part of the CSS specification, queries using :header cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :header to select elements, first select the elements using a pure CSS selector, then use .filter(":header").

jQuery( ":header" )

version added: 1.2

Examples:

Adds a background and text color to all the headers on the page.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>header demo</title>
  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>
<body>
 
<h1>Header 1</h1>
<p>Contents 1</p>
<h2>Header 2</h2>
<p>Contents 2</p>
 
<script>
$( ":header" ).css({ background: "#ccc", color: "blue" });
</script>
 
</body>
</html>

Links:

http://api.jquery.com/header-selector

doc_jQuery

2016-03-27 13:48:23

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