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<!doctype html>
<title>Interrupted drag with second in-document drag attempt</title>
body > div {
height: 200px;
width: 200px;
background-color: orange;
display: inline-block;
body > div + div {
background-color: navy;
body > div + div + div {
background-color: yellow;
body > div + div + div + div {
background-color: fuchsia;
<script type="text/javascript">
window.onload = function () {
var orange = document.getElementsByTagName('div')[0], blue = document.getElementsByTagName('div')[1], yellow = document.getElementsByTagName('div')[2], fuchsia = document.getElementsByTagName('div')[3];
orange.ondragstart = function (e) {
e.dataTransfer.effectAllowed = 'all';
yellow.ondragstart = function (e) {
e.dataTransfer.effectAllowed = 'all';
blue.ondragenter = function (e) {
alert('JS alert');
fuchsia.ondragenter = fuchsia.ondragover = function (e) {
fuchsia.ondrop = function (e) {
document.getElementsByTagName('ol')[0].textContent = e.dataTransfer.getData('text');
<div draggable="true"></div>
<div draggable="true"></div>
<li>Open this page in two separate tabs, and start on tab #1.</li>
<li>Drag the orange square over the blue square.</li>
<li>An alert may appear. Do not dismiss it. If an alert does not appear, PASS, and ignore any further steps.</li>
<li>Click the other tab to focus it (or focus it in whatever way works). If you cannot change tabs, PASS, and ignore any further steps.</li>
<li>On tab #2, drag the yellow square over the blue square. If you cannot drag the yellow square, PASS, and ignore any further steps.</li>
<li>An alert may appear. Do not dismiss it.</li>
<li>Return to tab #1.</li>
<li>Dismiss the alert without using the left mouse button (eg. use keyboard, or mouse gestures such as gesture-down,gesture-right).</li>
<li>Do a short drag and drop within the pink square. If nothing happens, PASS, and ignore any further steps.</li>
<li>The word &quot;PASS&quot; should appear in place of this text.</li>