transclude: element

<!DOCTYPE html>
<html ng-app="transclude-element">

  <head>
    <link data-require="foundation@*" data-semver="5.0.0" rel="stylesheet" href="//cdn.jsdelivr.net/foundation/5.0.0/css/normalize.css" />
    <link data-require="foundation@*" data-semver="5.0.0" rel="stylesheet" href="//cdn.jsdelivr.net/foundation/5.0.0/css/foundation.min.css" />
    <script data-require="jquery@*" data-semver="2.0.3" src="http://code.jquery.com/jquery-2.0.3.min.js"></script>
    <script data-require="angular.js@*" data-semver="1.2.9" src="http://code.angularjs.org/1.2.9/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body>
    <input type="text" drop-panel />
    This is some stuff under the panel
  </body>

</html>

angular.module('transclude-element', []).

directive('dropPanel', function(){
  return {
    transclude: 'element',
    replace: true,
    templateUrl: 'drop-panel.html',
    link: function(scope, el){
      var input = el.find('input[drop-panel]');
      
      input.focus(function(){
        el.addClass('is-active');
      });
      
      input.blur(function(){
        el.removeClass('is-active');
      });
    }
  }
});

.drop-panel {
  position: relative;
}

.drop-panel input[drop-panel] {
  margin-bottom: 0;
}

.drop-panel-panel {
  position: absolute;
  z-index: 100;
  background-color: white;
  border: 1px solid black;
  left: 0;
  right: 0;
  padding: 10px 20px;
  display: none;
}

.drop-panel.is-active .drop-panel-panel {
  display: block;
}

<div class='drop-panel'>
  <span ng-transclude></span>
  <div class='drop-panel-panel'>
    This is some panel content
  </div>
</div>