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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Timeline | Groups ordering</title>
+
+  <style>
+    body, html {
+      font-family: arial, sans-serif;
+      font-size: 11pt;
+    }
+
+    #visualization {
+      box-sizing: border-box;
+      width: 100%;
+      height: 300px;
+    }
+  </style>
+
+  <script src="../../../dist/vis.js"></script>
+  <link href="../../../dist/vis-timeline-graph2d.min.css" rel="stylesheet" type="text/css" />
+  <script src="../../googleAnalytics.js"></script>
+</head>
+<body>
+<p>
+  This example demonstrates custom ordering of groups.
+</p>
+<div id="visualization"></div>
+
+<script>
+  var groups = new vis.DataSet([
+    {id: 0, content: 'First', value: 1},
+    {id: 1, content: 'Third', value: 3},
+    {id: 2, content: 'Second', value: 2}
+  ]);
+
+  // create a dataset with items
+  // note that months are zero-based in the JavaScript Date object, so month 3 is April
+  var items = new vis.DataSet([
+    {id: 0, group: 0, content: 'item 0', start: new Date(2014, 3, 17), end: new Date(2014, 3, 21)},
+    {id: 1, group: 0, content: 'item 1', start: new Date(2014, 3, 19), end: new Date(2014, 3, 20)},
+    {id: 2, group: 1, content: 'item 2', start: new Date(2014, 3, 16), end: new Date(2014, 3, 24)},
+    {id: 3, group: 1, content: 'item 3', start: new Date(2014, 3, 23), end: new Date(2014, 3, 24)},
+    {id: 4, group: 1, content: 'item 4', start: new Date(2014, 3, 22), end: new Date(2014, 3, 26)},
+    {id: 5, group: 2, content: 'item 5', start: new Date(2014, 3, 24), end: new Date(2014, 3, 27)}
+  ]);
+
+  // create visualization
+  var container = document.getElementById('visualization');
+  var options = {
+    // option groupOrder can be a property name or a sort function
+    // the sort function must compare two groups and return a value
+    //     > 0 when a > b
+    //     < 0 when a < b
+    //       0 when a == b
+    groupOrder: function (a, b) {
+      return a.value - b.value;
+    },
+    editable: true
+  };
+
+  var timeline = new vis.Timeline(container);
+  timeline.setOptions(options);
+  timeline.setGroups(groups);
+  timeline.setItems(items);
+
+</script>
+</body>
+</html>
+\ No newline at end of file