third_party/blink/web_tests/fast/css/invalid-pseudo-classes.html - chromium/src - Git at Google

 <head>
 <style>
 div:not(:wakkawakka(n)), div { color: red }
 body:wakkawakka > div, div { color: red }
 </style>
 </head>
 <body>
 <div>This text should not be red.</div>
 </body>
	<head>
	<style>
	div:not(:wakkawakka(n)), div { color: red }
	body:wakkawakka > div, div { color: red }
	</style>
	</head>
	<body>
	<div>This text should not be red.</div>
	</body>