code: function(context) {
      if (context._wysihtml5_supportsHTML5Tags) {
        return;
      }
      for (var i=0, length=HTML5_ELEMENTS.length; i<length; i++) {
        context.createElement(HTML5_ELEMENTS[i]);
      }
      context._wysihtml5_supportsHTML5Tags = true;
    }
docs: Make sure IE supports HTML5 tags, which is accomplished by simply creating one instance of each element