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<!doctype html>
<title>Alert during dragenter for file drag with release over dialog</title>
body > div {
height: 200px;
width: 200px;
background-color: orange;
display: inline-block;
<script type="text/javascript">
window.onload = function () {
var orange = document.getElementsByTagName('div')[0];
orange.ondragenter = function (e) {
alert('JS alert');
orange.ondragover = orange.ondrop = function (e) {
<div draggable="true"></div>
<li>Drag a file (one that your browser cannot open natively, such as an executable file) from your system file manager over the orange square.</li>
<li>An alert may appear - release the mouse over the dialog. Dismiss it (you may need to use keyboard or mouse gestures such as gesture-down,gesture-right). If it does not appear, release the drag and accept any prompt to upload the file.</li>
<li>If a file download dialog appears, cancel it and return to this page.</li>
<li>Fail if the alert reappears.</li>
<li>The mouse cursor may continue to show that a drag is in operation. If so, attempt to select some of this text with the mouse before continuing to the text step.</li>
<li>Fail if the mouse continues to show that a drag is in operation.</li>
<li>Try to select some text in this sentence. Fail if it is not possible.</li>