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   1  // element-closest | CC0-1.0 | github.com/jonathantneal/closest
   2  
   3  (function (ElementProto) {
   4      if (typeof ElementProto.matches !== 'function') {
   5          ElementProto.matches = ElementProto.msMatchesSelector || ElementProto.mozMatchesSelector || ElementProto.webkitMatchesSelector || function matches(selector) {
   6              var element = this;
   7              var elements = (element.document || element.ownerDocument).querySelectorAll(selector);
   8              var index = 0;
   9  
  10              while (elements[index] && elements[index] !== element) {
  11                  ++index;
  12              }
  13  
  14              return Boolean(elements[index]);
  15          };
  16      }
  17  
  18      if (typeof ElementProto.closest !== 'function') {
  19          ElementProto.closest = function closest(selector) {
  20              var element = this;
  21  
  22              while (element && element.nodeType === 1) {
  23                  if (element.matches(selector)) {
  24                      return element;
  25                  }
  26  
  27                  element = element.parentNode;
  28              }
  29  
  30              return null;
  31          };
  32      }
  33  })(window.Element.prototype);