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<!DOCTYPE html>
<title>Dropping on always-on-top application windows that overlay the browser</title>
html, body, ol {
margin: 0;
padding: 0;
height: 100%;
width: 100%;
background: blue;
color: black;
list-style-position: inside;
div {
height: 100px;
width: 100px;
position: absolute;
top: 50%;
left: 50%;
margin-top: -50px;
margin-left: -50px;
background: orange;
<script type="text/javascript">
window.onload = function() {
var orange = document.getElementsByTagName('div')[0];
orange.ondragstart = function(e) {
e.dataTransfer.effectAllowed = 'copy';
e.dataTransfer.setData('Text', 'dummy text');
var blue = document.getElementsByTagName('ol')[0];
blue.ondragenter = blue.ondragover = function(e) {
blue.ondrop = function(e) {
this.innerHTML = 'FAIL';
<li>Position the browser window so that the blue part of this page extends behind the system taskbar.</li>
<li>Use your mouse to drag the orange box over a part of the taskbar that overlays the blue part of this page.</li>
<li>If supported by the platform, the mouse cursor should <em>not</em> show the browser's custom &quot;copy&quot; cursor, and should instead show the system's expected cursor for dropping on that part of the taskbar.</li>
<li>Release the drag. Fail if the text on this page changes.</li>
<li>Reload and repeat this test for:<ul>
<li>Where the blue part of this page extends under an always-on-top window (eg. the Windows Task Manager).</li>
<li>Where the blue part of this page extends under an always-on-top notification (eg. a system tray info balloon).</li>
<div draggable='true'></div>
<noscript><p>Enable JavaScript and reload</p></noscript>