servo/tests/wpt/css-tests/css-conditional-3_dev/html/css-supports-016.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 valid syntax and a passing condition must 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="">
<meta name="assert" content="A negation of an @supports condition must pass if and only if the sub-condition fails. The sub-condition here is a supported property name with an unsupported value.">
<link rel="match" href="support/pass.htm">
<style type="text/css">
@supports not (color: rainbow) {
html { background-color: green }
}
</style>
</head>
<body>
</body>
</html>