function _createPlaceholderNode(doc) {
    // Important: placeholder element needs to be an inline element
    // otherwise chrome will cause trouble when interacting with the text
    var element       = doc._wysihtml5CaretPlaceholder = (doc._wysihtml5CaretPlaceholder || doc.createElement("span"));
    element.innerHTML = PLACEHOLDER_TEXT;
    return element;
  }
Force rerendering of a given element
Needed to fix display misbehaviors of IE

@author Christopher Blum <christopher.blum@xing.com>
@param {Element} element The element object which needs to be rerendered
@example
   wysihtml5.quirks.redraw(document.body);