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<?xml version="1.0" encoding="utf-8"?>
<head>
<title>Dropping image on horizontal iframe scrollbar</title>
<style type="text/css">
p:first-child
{padding-left:1em;}
iframe
{height:3em;
width:4em;}
img
{width:5px;
height:5px;}
</style>
<script type="application/ecmascript">
function dragImage()
{event.dataTransfer.effectAllowed = 'copy';}
function dropImage(event)
{document.querySelector('p + p').firstChild.nodeValue = 'PASS';}
</script>
</head>
<body ondragenter="event.preventDefault()" ondragover="return false">
<p><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEElEQVR42mNgaGD4D8YwBgAw9AX9Y9zBwwAAAABJRU5ErkJggg==" alt="PNG green pixel" ondragstart="dragImage()" ondragend="dropImage(event)"/></p>
<p>Drag little square above and drop it on horizontal scrollbar. Word PASS should appear once you drop it.</p>
<iframe src="helper-drop-horizontal-scrollbar.xhtml">XHTML document</iframe>
</body>
</html>