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Test Info:

<html>↩
<head>↩
<title>Bug 1160342 - Implement marquee using mutation observers</title>↩
</head>↩
<body onload="document.getElementById('a').setAttribute('direction', 'right')">↩
<marquee id="a" behavior=alternate scrollamount=0>↩
This text should be visible↩
</marquee>↩
</body>↩
</html>↩