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chromium/third_party/blink/manual_tests/visited-link-new-window.html 

<!DOCTYPE html>
<html>
<head>
<title>Visited link coloring test</test>
<style>
:visited {
    color: limegreen;
}
</style>
</head>
<body>
<h1>Visited link coloring test</h1>
<p>Make sure the link below is not colored as visited (delete the item
for visited-link.html from your history and restart if
necessary). Then cmd-click it. The link should turn lime green.</p>
<a href="resources/visited-link.html">Am I a visited link?</a>
</body>
</html>