attr/xmlns/xmlns-xml-2.xhtml

<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>[xmlns|xml]</title>
<style type="text/css">
@namespace xmlns 'http://www.w3.org/2000/xmlns/';

html {
  color: blue;
}
html[xmlns|xml] {
  color: red;
}

#fail {
  display: none;
}
[xmlns|xml] #fail {
  display: block;
}
[xmlns|xml] #pass {
  display: none;
}
</style>
</head>
<body>
<p id="pass">PASS</p>
<p id="fail">FAIL</p>
</body>
</html>
1	wakaba	1.1	<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">
2			<head>
3			<title>[xmlns\|xml]</title>
4			<style type="text/css">
5			@namespace xmlns 'http://www.w3.org/2000/xmlns/';
6
7			html {
8			color: blue;
9			}
10			html[xmlns\|xml] {
11			color: red;
12			}
13
14			#fail {
15			display: none;
16			}
17			[xmlns\|xml] #fail {
18			display: block;
19			}
20			[xmlns\|xml] #pass {
21			display: none;
22			}
23			</style>
24			</head>
25			<body>
26			<p id="pass">PASS</p>
27			<p id="fail">FAIL</p>
28			</body>
29			</html>