Retrieve HTML5 custom data-* attributes (or any others) key/value pairs sans-camel-case. data-* usage: <a href="http://trailerparks.com" data-trailer="airstream" data-park="double dutch RV park">Live the dream!</a> <script> var data = datadash(document.getElementsByTagName()[0]); assertEquals(data['data-trailer'], 'airstream'); assertEquals(data['data-park'], 'double dutch RV park'); </script>