User tests: Successful: Unsuccessful:
The layout file used for the module frontend edit is loading Bootstrap CSS files using JHtml::_('bootstrap.loadCss');
This command should never be used in an extension as it WILL break templates, even Protostar.
Forgot Tracker: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32498&start=0&feedback=Element+wird+nun+%C3%BCberwacht