<span class="sr-only">{{tip_text}}</span>
<span class="ico ico-tooltip fa fa-info-circle chart-tooltip has-tooltip" data-toggle="tooltip"
   data-placement="top" data-track-event="edx.bi.tooltip.displayed" data-track-type="tooltip"
   data-track-category="{{track_category}}" title="{{tip_text}}" aria-hidden="true"></span>
