<!DOCTYPE HTML>
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								<!-- 
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								  This example is used mainly for developers to test performance issues by controlling number of groups, 
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								  number of items and their types.
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								 -->
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								<html>
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								<head>
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								  <title>Timeline | onTimeout example</title>
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								  <script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.8.4/moment.min.js"></script>
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								  <script src="../../../dist/vis.js"></script>
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								  <link href="../../../dist/vis-timeline-graph2d.min.css" rel="stylesheet" type="text/css" />
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								</head>
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								<body>
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								  <div id="visualization"></div>
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								</body>
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								<script>
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								  var now = moment();
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								  var itemCount = 300;
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								  var types = ['point', 'range', 'box']
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								  // create a dataset with items
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								  var items = new vis.DataSet();
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								  for (var i = 0; i < itemCount; i++) {
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								    var start = now.clone().add(Math.random() * 180, 'days');
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								    var end = start.clone().add(Math.random() * 30, 'days');
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								    items.add({
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								      id: i,
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								      type: types[Math.floor(Math.random() * types.length)],
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								      content: '' + i,
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								      start: start,
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								      end: end
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								    });
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								  }
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								  // create visualization
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								  var container = document.getElementById('visualization');
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								  var options = {
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								    stack: true,
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								    onTimeout: {
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								      timeoutMs: 1000,
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								      callback: function(callback) {
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								        var didUserCancel;
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								        var didUserCancel = confirm("Too many items loaded! Would you like to continue rendering (this might take a while)?");
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								        callback(didUserCancel)
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								      },
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								    }
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								  };
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								  var timeline = new vis.Timeline(container, items, options);
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								</script>
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								</html>
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