openproject/public/templates/work_packages/tabs/_user_activity.html

<div class="work-package-details-activities-activity-contents">
  <div class="comments-number"><a ng-href="#{{ currentAnchor }}" ng-bind="'#' + ($index+1)"></a>
  </div>
  <img class="avatar" ng-src="{{ activity.props.userAvatar }}" />
  <span class="user"><a ng-href="{{ userPath(activity.props.userId) }}" name="{{ currentAnchor }}" ng-bind="activity.props.userName"></a></span>
  <span class="date">commented on <span ng-bind="activity.props.createdAt | date:'short'"/></span>
  <span class="comment">
    <span class="message" ng-show="activity.props._type == 'Activity::Comment'">{{ activity.props.comment }}</span>
    <ul class="work-package-details-activities-messages">
      <li ng-repeat="detail in activity.props.htmlDetails track by $index">
        <span class="message" ng-bind-html="detail"/>
      </li>
    </ul>
  </span>
</div>