Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
p:first-child {
    color: blue;
} 
</style>
</head>
<body>

<p>This is some text.</p>
<p>This is some text.</p>
<p><b>Note:</b> For :first-child to work in IE8 and earlier, a DOCTYPE must be declared.</p>

</body>
</html>