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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test GetDir() for elements</title>
<script type="text/javascript">
function fill() {
for (var i = 0; ; ++i) {
div = document.getElementById("div" + i);
if (!div) break;
span = document.getElementById("span" + i);
span.innerHTML = div.dir;
}
}
</script>
</head>
<body onLoad="fill()">
<div id="div0" dir="">dir="", getDir returns "<span id="span0"></span>"</div>
<div id="div1" dir="ltr">dir="ltr", getDir returns "<span id="span1"></span>"</div>
<div id="div2" dir="rtl">dir="rtl", getDir returns "<span id="span2"></span>"</div>
<div id="div3" dir="auto">dir="auto", getDir returns "<span id="span3"></span>"</div>
<div id="div4" dir="foopy">dir="foopy", getDir returns "<span id="span4"></span>"</div>
<div id="div5">no dir attribute, getDir returns "<span id="span5"></span>"</div>
</body>
</html>