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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<head>
<style><![CDATA[
.first-line { background-color: lime; }
]]></style>
</head>
<body>
<p><span class="first-line">The first line of this paragraph should have a green background.</span></p>
</body>
</html>