Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function Element_Classic() {
      this.children = [];
    }
    
    function Element_Getter() {}
    Object.defineProperty(
      Element_Getter.prototype,
      "children", {
      get: function () {
        return Object.defineProperty(
          this, "children", {value: []}
        ).children;
      }
    });
    
    var result;
  };
</script>

Test runner

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result = new Element_Classic;

result = new Element_Classic;
for(var i = 0; i < 100; i++) {
  result.children.push(i);
}

result = new Element_Getter;

result = new Element_Getter;
for(var i = 0; i < 100; i++) {
  result.children.push(i);
}

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