:header Selector
Selects all elements that are headers, like h1, h2, h3 and so on.
.header()
Adds a background and text color to all the headers on the page.
JS
<h1>Header 1</h1>
<p>Contents 1</p>
<h2>Header 2</h2>
<p>Contents 2</p>
HTML
$(":header").css({ background: "#ccc", color: "blue" });
DEMO