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chromium/third_party/blink/web_tests/editing/style/redundant-background-color.html 

<!doctype html>
<html>
<head>
<title>Redundant background-color</title>
<script src="../../resources/dump-as-markup.js"></script>
</head>
<body>
<div id="div">Hello</div>

<script>
Markup.description("This tests to make sure that WebKit removes redundant background-color property after execCommand. (See the bug 91783). There should be no background-color property below.");

var div = document.getElementById("div");
div.contentEditable = true;
div.style.cssText = "background-color: white;";

var range = document.createRange();
range.selectNodeContents(div);
window.getSelection().addRange(range);

document.execCommand("insertUnorderedList");

Markup.dump(div);
</script>
</body>
</html>