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chromium/third_party/blink/web_tests/fast/css/invalid-import-rule-insertion.html 

<html>
<head>
    <title>HIERARCHY_REQUEST_ERR raised if @import rule inserted after a regular rule</title>
    <style type="text/css">
        body {color: Blue; }
        div {color: Red; }
    </style>
    <script>
    if (window.testRunner)
        testRunner.dumpAsText();
    </script>
</head>
<body>
    <div>This text should be red and the page should have no other style.</div>
    <div id="testresult">Fail</div>
    <script type="text/javascript">
        try
        {
            document.styleSheets[0].insertRule("@import url(testStyle1.css);", 1);
        }
        catch(e)
        {
            if(window.getComputedStyle(document.body, "").getPropertyValue("background-color") == "rgba(0, 0, 0, 0)" && document.styleSheets[0].cssRules.length == 2)
            {
                document.getElementById("testresult").innerHTML = "Pass";
            }
        }
    </script>
</body>
</html>