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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<title>Bug 4477749</title>
<style type="text/css">
div.scroller { overflow: scroll; width: 100px; }
span { border: 1px solid blue; }
</style>
<script type="text/javascript">
function testit()
{
var inner=document.getElementById("testinner").childNodes[0];
window.getSelection().collapse(inner, 0);
document.getElementById("testmid").scrollLeft=-1000;
document.getElementById("testouter").style.direction="ltr";
}
</script>
</head>
<body onload="testit()">
<div id="testouter" dir="rtl">
<div id="testmid" class="scroller"><span id="testinner">TextTextTextTextTextTextTextTextTextTextTextTextTextTextTextTextTextText</span></div>
</div>
</body>
</html>