<!DOCTYPE html>
<html>
<head>
<style>h1::before {
content: url("smiley.gif");
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<p>The ::before pseudo-element inserts content before the content of an element.</p>
<h1>This is a heading</h1>
<p><b>Note:</b> IE8 supports the content property only if a !DOCTYPE is specified.</p>
</body>
</html>