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<!doctype html>
<title>drag &amp; drop - manually closing a tab while a drag is in operation</title>
<style type="text/css">
p.gone, ul { display: none; }
p.gone + ul { display: block; }
<script type="text/javascript">
window.onload = function() {
if( location.href.match(/#popup$/) ) { document.getElementsByTagName('p')[0].className = 'gone'; }
document.getElementsByTagName('ul')[0].ondragstart = function(e) {
e.dataTransfer.effectAllowed = 'copy';
e.dataTransfer.setData('Text', 'dummy text');
<p><a href="#popup" target="_blank">Open this page in a new tab</a>.</p>
<ul draggable='true'>
<li>Drag this text downwards, and do not release the drag.</li>
<li>Use a keyboard shortcut (eg. Ctrl+W on Windows) to close the tab.</li>
<li>The browser may optionally cancel the drag. The browser may optionally close the tab. Fail if the drag placeholder gets stuck. Fail if the browser crashes.</li>
<noscript><p>Enable JavaScript and reload</p></noscript>