Filter function for Angular's jqlite element

element.filter.js

/**
 * Adds a filter() method to Angular's jqlite
 */
(function (angular) {
  
  /**
   * Polyfill from MDN (mostly to cover IE9 and edge browsers)
   * https://developer.mozilla.org/en/docs/Web/API/Element/matches
   */
  if (!Element.prototype.matches) {
      Element.prototype.matches = 
          Element.prototype.matchesSelector || 
          Element.prototype.mozMatchesSelector ||
          Element.prototype.msMatchesSelector || 
          Element.prototype.oMatchesSelector || 
          Element.prototype.webkitMatchesSelector ||
          function(s) {
              var matches = (this.document || this.ownerDocument).querySelectorAll(s),
                  i = matches.length;
              while (--i >= 0 && matches.item(i) !== this) {}
              return i > -1;            
          };
  }  
  /**
   * END OF MDN Polyfill
   */
  
  /**
   * Does the actual work of providing a basic selector filter
   */
  angular.element.prototype.filter = function (selector) {
    return angular.element(
      Array.prototype.filter.call(this, function (el) {
        return el && (el instanceof Element) && 
               el.nodeType === 1 &&
               el.matches(selector);
      })
    );
  };
  
}(angular));