<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Clear datastore data during link drag and drop</title>
<style type="text/css">
div
  {height:100px;
  width:100px;
  padding:20px;
  background-color:silver;}
</style>
<script type="application/ecmascript">
<![CDATA[
var dataTypes = ['text/uri-list', 'text/plain', 'application/xml', 'application/xhtml+xml', 'application/mathml+xml', 'image/svg+xml', 'text/html', 'text/x-example'],
data = ['data:text/plain,FAIL', 'FAIL', '<result>FAIL</result>', '<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Data store item</title></head><body><p>FAIL</p></body></html>', '<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>1</mn></math>', '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100px" height="50px" viewBox="0 0 100 50"><text x="0" y="40" font-size="40" fill="green">FAIL</text></svg>', '<!DOCTYPE html><html><head><title>Data store item</title></head><body><p>FAIL</p></body></html>', 'FAIL'];
function start(event)
  {event.dataTransfer.effectAllowed = 'copy';
  for(var i = 0; i != dataTypes.length; i++)
    {event.dataTransfer.setData(dataTypes[i], data[i]);}
  say('items.length (dragstart) : ' + ((event.dataTransfer.items.length >= dataTypes.length)?'PASS':'FAIL'));
  }
function start(event)
  {event.dataTransfer.effectAllowed = 'copy';
  l = event.dataTransfer.items.length;
  for(var i = 0; i != dataTypes.length; i++)
    {event.dataTransfer.setData(dataTypes[i], data[i]);}
  event.dataTransfer.clearData();
  say('items.length (dragstart) : ' + ((event.dataTransfer.items.length == 0)?'PASS':'FAIL'));}
function dragElement(event)
  {for(var i = 0; i != dataTypes.length; i++)
    {event.dataTransfer.setData(dataTypes[i], 'FAIL');
    if(event.dataTransfer.getData(dataTypes[i]))
      {say('getData(' + dataTypes[i] + ') : FAIL (data store should not be readable during drag)')}
    }
  if(event.dataTransfer.items.length != 0)
    {say('items.length (dragover) : FAIL')}
  }
function enterElement(event)
  {event.preventDefault();
  for(var i = 0; i != dataTypes.length; i++)
    {event.dataTransfer.setData(dataTypes[i], 'FAIL');
    if(event.dataTransfer.getData(dataTypes[i]))
      {say('getData(' + dataTypes[i] + ') : FAIL (data store should not be readable during dragenter)')}
    }
  say('items.length (dragenter) : ' + ((event.dataTransfer.items.length == 0)?'PASS':'FAIL'));}
function dataDrop(event)
  {say('items.length (drop) : ' + ((event.dataTransfer.items.length == 0)?'PASS':'FAIL'));
  for(var i = 0; i != dataTypes.length; i++)
    {say('getData(' + dataTypes[i] + ') : ' + ((event.dataTransfer.getData(dataTypes[i]) == '')?'PASS':'FAIL'));}
  document.querySelector('div').setAttribute('style','background-color:green');}
function say(it)
  {document.querySelector('pre').appendChild(document.createTextNode(it + '\n'));}
]]>
</script>
</head>
<body>
<p><a href="data:text/plain,1" ondragstart="start(event)" ondrag="dragElement(event)">Drag me</a></p>
<p>Drag link above to the silver box below and drop it. Silver box should turn green and test results should appear below.</p>
<div ondragenter="enterElement(event)" ondragover="return false;" ondrop="dataDrop(event)"/>
<pre/>
</body>
</html>