diff --git a/js/dos/ext/vis/examples/timeline/groups/subgroups.html b/js/dos/ext/vis/examples/timeline/groups/subgroups.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+    <title>Timeline | Background areas</title>
+
+    <style>
+        body, html {
+            font-family: arial, sans-serif;
+            font-size: 11pt;
+        }
+
+        .vis-item.vis-background.negative {
+            background-color: rgba(255, 0, 0, 0.2);
+        }
+        .vis-item.vis-background.positive {
+            background-color: rgba(105, 255, 98, 0.20);
+        }
+        .vis-item.vis-background.marker {
+            border-left: 2px solid green;
+        }
+    </style>
+
+    <script src="../../../dist/vis.js"></script>
+    <link href="../../../dist/vis.css" rel="stylesheet" type="text/css" />
+    <script src="../../googleAnalytics.js"></script>
+</head>
+<body>
+
+<p>This example shows the workings of the subgroups. Subgroups do not use stacking, and only work when stacking is disabled.</p>
+
+<div id="visualization"></div>
+
+<script>
+    // create a dataset with items
+    // we specify the type of the fields `start` and `end` here to be strings
+    // containing an ISO date. The fields will be outputted as ISO dates
+    // automatically getting data from the DataSet via items.get().
+    var items = new vis.DataSet({
+        type: { start: 'ISODate', end: 'ISODate' }
+    });
+    var groups = new vis.DataSet([{
+        id: 'bar', content:'bar', subgroupOrder: function (a,b) {return a.subgroupOrder - b.subgroupOrder;}
+    },{
+        id: 'foo', content:'foo', subgroupOrder: 'subgroupOrder' // this group has no subgroups but this would be the other method to do the sorting.
+    }]);
+    // add items to the DataSet
+    items.add([
+        {id: 'A',start: '2014-01-20', end: '2014-01-22', type: 'background', group:'foo'},
+        {id: 'B',start: '2014-01-22', end: '2014-01-23', type: 'background', group:'foo', className: 'negative'},
+        {id: 0, content: 'no subgroup', start: '2014-01-20', end: '2014-01-22',group:'foo'},
+
+        {id: 'SG_1_1',start: '2014-01-25', end: '2014-01-27', type: 'background', group:'bar', subgroup:'sg_1', subgroupOrder:0},
+        {id: 'SG_1_2', start: '2014-01-26', end: '2014-01-27', type: 'background', className: 'positive',group:'bar', subgroup:'sg_1', subgroupOrder:0},
+        {id: 1, content: 'subgroup0', start: '2014-01-23 12:00:00', end: '2014-01-26 12:00:00',group:'bar', subgroup:'sg_1', subgroupOrder:0},
+        {id: 'SG_2_1', start: '2014-01-27', end: '2014-01-29', type: 'background', group:'bar', subgroup:'sg_2', subgroupOrder:1},
+        {id: 'SG_2_2', start: '2014-01-27', end: '2014-01-28', type: 'background', className: 'negative',group:'bar', subgroup:'sg_2', subgroupOrder:1},
+        {id: 2, content: 'subgroup1', start: '2014-01-27', end: '2014-01-29',group:'bar', subgroup:'sg_2', subgroupOrder:1},
+
+        {id: 'background', start: '2014-01-29', end: '2014-01-30', type: 'background', className: 'negative',group:'bar'},
+        {id: 'background_all', start: '2014-01-31', end: '2014-02-02', type: 'background', className: 'positive'},
+    ]);
+
+    var container = document.getElementById('visualization');
+    var options = {
+        // orientation:'top'
+        start: '2014-01-10',
+        end: '2014-02-10',
+        editable: true,
+        stack: false
+    };
+
+    var timeline = new vis.Timeline(container, items, groups, options);
+
+</script>
+</body>
+</html>
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