 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>
