<!DOCTYPE html>
<html>
<head>
<style>
p:first-child {
background-color: yellow;
}
</style>
</head>
<body>
<p>This paragraph is the first child of its parent (body).</p>
<h1>Welcome to My Homepage</h1>
<p>This paragraph is not the first child of its parent.</p>
<div>
<p>This paragraph is the first child of its parent (div).</p>
<p>This paragraph is not the first child of its parent.</p>
</div>
<p><b>Note:</b> For :first-child to work in IE8 and earlier, a DOCTYPE must be declared.</p>
</body>
</html>