dist/u.packed.js
function(child) {
      return this.length ? (/^o/.test(typeof child) ? this[0] !== child[0] && this[0].contains(child[0]) : this[0].querySelector(child) !== null) : false;
    }
function(child) {
      return this.length ? (/^o/.test(typeof child) ? this[0] !== child[0] && this[0].contains(child[0]) : this[0].querySelector(child) !== null) : false;
    }
function ( child ) { return this . length ? ( / ^o / . test ( typeof child ) ? this [ 0 ] !== child [ 0 ] && this [ 0 ] . contains ( child [ 0 ] ) : this [ 0 ] . querySelector ( child ) !== null ) : false ; }
contains method
check if child is contained in this element
@param  {(string|object)} child - element or css selector
@return {boolean}
contains method check if child is contained in this element