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chromium/third_party/blink/web_tests/external/wpt/css/cssom/font-shorthand-serialization.html 

<!doctype html>
<html>
<meta charset="utf-8">
<title>Serialization of font shorthand</title>
<link rel="help" href="https://drafts.csswg.org/cssom-1/#serialize-a-css-declaration-block">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<div id="target" style="font: 10px/1 Ahem;"></div>
<script>
    test(function() {
        var target = document.getElementById('target');
        assert_equals(target.style.cssText, 'font: 10px / 1 Ahem;');
        assert_equals(target.style.font, '10px / 1 Ahem');
    }, "The font shorthand should be serialized just like any other shorthand.");
</script>
</html>