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chromium/third_party/blink/web_tests/fast/inspector-support/style.html 

<html>
<head>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
<style>
div { background: purple; margin: 1em; color: white; font: 24px 'Lucida Grande'; }
</style>
</head>
<body>
Note that background is buggy right now!
<div id="foo">Test</div>
<script>
var ruleList = document.styleSheets[0].rules;
var decl = ruleList[0].style;
for (var i = 0; i < decl.length; i++) {
    document.write(decl[i] + ": " + decl.getPropertyValue(decl[i]));
    document.write( "<br>");
}
</script>
</body>
</html>