enter(element, parent, [after], [options]);
Inserts the element into the DOM either after the after element (if provided) or as the first child within the parent element and then triggers an animation. A promise is returned that will be resolved during the next digest once the animation has completed. 
Parameters
Param Type Details  element   DOMElement   the element which will be inserted into the DOM   parent   DOMElement   the parent element which will append the element as a child (so long