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chromium/third_party/blink/web_tests/fast/css-generated-content/no-openclose-quote.html 

<html>
    <head>
        <style type="text/css">
            p:before { content: "*" no-open-quote; }
            p:after { content: "*" no-close-quote; }
        </style>
    </head>
    <body>
        <p>This is some text.  It should have a single asterisk before and after it.</p>
    </body>
</html>