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Test Info:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<head>
<title>CSS Test: Valid Identifiers (starting with _) as Classes and IDs</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/"/>
<link rel="match" href="ident-000-ref.xht"/>
<style type="text/css">
.one { color: red; background: white; }
._ident, .one { color: green; }
.two { color: red; background: white; }
#_ident, .two { color: green; }
</style>
</head>
<body>
<p class="one">This should be green.</p>
<p class="two">This should be green.</p>
</body>
</html>