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chromium/third_party/blink/web_tests/fast/css/selector-set-attribute.html 

<html>
<head>
<title>setAttribute() Test</title>

<style type="text/css" title="text/css">

    p { display:none; color: red; }
    p[title] { display:block; color: green; }
    p[id] { display:block; color: green; }
    p[class] { display:block; color: green; }
    p[lang] { display:block; color: green; }

</style>

<script type="text/javascript">
    window.onload = init;
    
    function init() 
    {
        document.getElementsByTagName('p')[0].setAttribute('class','test');
        document.getElementsByTagName('p')[1].setAttribute('id','test');
        document.getElementsByTagName('p')[2].setAttribute('title','This is a test');
        document.getElementsByTagName('p')[4].setAttribute('lang','en');
    }
</script>

</head>
<body>
    <h1>setAttribute() Test</h1>
    <p>
        This element's Class attribute is set using setAttribute(). It should be green.     
    </p>
    <p>
        This element's ID attribute is set using setAttribute(). It should be green.        
    </p>
    <p>
        This element's Title attribute is set using setAttribute(). It should be green.     
    </p>
    <p title="This is hard-coded">
        This element's Title attribute is hard-coded. It should be green.       
    </p>
    <p>
        This element's Lang attribute is set using setAttribute(). It should be green.     
    </p>
</body>
</html>