code: function containsActiveElement (el) {
    const node = el && findDOMNode(el)
    const active = getActiveElement()
    return (node && (active === node || contains(node,active)))
  }
docs: ---
  category: utilities/DOM
  ---
  
  Determine if an element contains the active element
  
  @param {ReactComponent|DomNode} el - component or DOM node
  @returns {boolean} if the element contains the active element