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chromium/third_party/blink/web_tests/fast/css/pendingStylesheetFontSize.html 

<html>
<head>
<style type="text/css">
     @import "pretty.css";
</style>
</head>

<body>
<div id="div">FAILED: This test fails if the font-size unresolved or incorrect.</div>

<script type="text/javascript">
    var elem = document.getElementById("div");
    var style = document.defaultView.getComputedStyle(elem, null);
    var fontSize = style.getPropertyValue("font-size");   
    elem.style.fontSize = fontSize;

    if (fontSize == "16px")
        elem.innerHTML = "SUCCEEDED! This test passes if the font-size is non-zero and is correctly 16px.";
</script>
</body>
</html>