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<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Canvas drag and drop: allowed effects 'copy','move','link'</title>
<style type="text/css">
div
  {display:inline-block;
  vertical-align:top;
  background-color:olive;
  color:white;
  padding:20px;
  width:100px;
  height:100px;}
div:nth-child(2)
  {background-color:green;}
div:nth-child(3)
  {background-color:teal;}
</style>
<script type="application/ecmascript">
var effects = ['copy','move','link'], i = 0;
function dropSelection(event)
  {event.target.appendChild(document.createTextNode((event.dataTransfer.dropEffect == effects[i] &amp;&amp; event.dataTransfer.effectAllowed == effects[i])?' PASS ':' FAIL '));
  i = (i + 1)%3;}
function start(event)
  {event.dataTransfer.effectAllowed = effects[i]}
</script>
</head>
<body onload="selectText()">
<p>
  <canvas width="100" height="100" draggable="true" ondragstart="start(event)" ondragenter="event.preventDefault()" ondragover="return false" ondrop="addImage(event)">Canvas</canvas>
</p>
<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
<div ondragenter="event.preventDefault()" ondragover="return false" ondrop="dropSelection(event)"/>
<p>You should be able to drag canvas pattern and drop it onto any of the green boxes.</p>
<script type="application/ecmascript">
var canvas = document.querySelector('canvas'),
c = canvas.getContext('2d');
for(var x = 0; x != 50; x++)
  {c.fillStyle = (x%2 == 0)?'navy':'white';
  c.beginPath();
  c.moveTo(x,x);
  c.lineTo(100-x,x);
  c.lineTo(100-x,100-x);
  c.lineTo(x,100-x);
  c.closePath();
  c.fill();}
</script>
</body>
</html>