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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Timeline | Background areas with groups</title>
+
+  <style>
+    body, html {
+      font-family: arial, sans-serif;
+      font-size: 11pt;
+    }
+  </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 the item type "background" when using groups.</p>
+<ul>
+  <li>Background items having a group are displayed in that group</li>
+  <li>Background items without a group are spread over the whole timeline</li>
+  <li>Background items with a non-existing group are not displayed</li>
+</ul>
+<div id="visualization"></div>
+
+<script>
+  var items = new vis.DataSet([
+    {id: 'A', content: 'Period A', start: '2014-01-16', end: '2014-01-22', type: 'background', group: 1},
+    {id: 'B', content: 'Period B', start: '2014-01-23', end: '2014-01-26', type: 'background', group: 2},
+    {id: 'C', content: 'Period C', start: '2014-01-27', end: '2014-02-03', type: 'background'}, // no group
+    {id: 'D', content: 'Period D', start: '2014-01-14', end: '2014-01-20', type: 'background', group: 'non-existing'},
+    {id: 1, content: 'item 1<br>start', start: '2014-01-30', group: 1},
+    {id: 2, content: 'item 2', start: '2014-01-18', group: 1},
+    {id: 3, content: 'item 3', start: '2014-01-21', group: 2},
+    {id: 4, content: 'item 4', start: '2014-01-17', end: '2014-01-21', group: 2},
+    {id: 5, content: 'item 5', start: '2014-01-28', type:'point', group: 2},
+    {id: 6, content: 'item 6', start: '2014-01-25', group: 2}
+  ]);
+
+  var groups = new vis.DataSet([
+    {id: 1, content: 'Group 1'},
+    {id: 2, content: 'Group 2'}
+  ]);
+
+  var container = document.getElementById('visualization');
+  var options = {
+    start: '2014-01-10',
+    end: '2014-02-10',
+    editable: true
+  };
+
+  var timeline = new vis.Timeline(container, items, groups, options);
+
+</script>
+</body>
+</html>
+\ No newline at end of file