servo/tests/wpt/css-tests/css-conditional-3_dev/html/css-supports-017.htm

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>CSS Test: An @supports rule with invalid syntax must not apply rules inside it</title>
<link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
<link rel="help" href="http://www.w3.org/TR/css3-conditional/#at-supports">
<meta name="flags" content="invalid">
<meta name="assert" content="The sub-condition of a negation in an @supports condition must be in parentheses.">
<link rel="match" href="support/pass.htm">
<style type="text/css">
html { background-color: green }
@supports not not (color: green) {
html { background-color: red }
}
</style>
</head>
<body>
</body>
</html>