<?xml version="1.0" encoding="utf-8"?>
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="500px" height="500px" viewBox="0 0 500 500">
<title>Drag and drop of SVG links</title>
<a xlink:href="data:text/plain,olive">
	<circle cx="50" cy="50" r="50" fill="olive"/>
</a>
<a xlink:href="data:text/plain,green">
	<circle cx="200" cy="50" r="50" fill="green"/>
</a>
<a xlink:href="data:text/plain,teal">
	<circle cx="350" cy="50" r="50" fill="teal"/>
</a>
<textArea x="10" y="120" width="480" height="200" font-size="30">Drag one of green circles above and drop it in the gray box below. Gray box should turn green.</textArea>
<rect x="10" y="300" width="480" height="190" fill="gray"/>
<script type="application/ecmascript">
var a = document.querySelectorAll('a'), rect = document.querySelector('rect');
for(var i = 0; i != a.length; i++)
	{a[i].addEventListener('dragstart',
	function (event)
		{event.dataTransfer.effectAllowed = 'copy';}
	,false);}
rect.addEventListener('dragenter',
function (event)
	{event.preventDefault()}
,false);
rect.addEventListener('dragover',
function (event)
	{event.preventDefault()}
,false);
rect.addEventListener('drop',
function (event)
	{rect.setAttribute('fill',event.dataTransfer.getData('text/uri-list').substr(16).replace(/\r\n$/,''));}
,false);
</script>
</svg>