Preparation code

<div id="testdiv" data-param="1"></div>
<script>
  Benchmark.prototype.setup = function() {
    var div = document.getElementById("testdiv");
    div.setAttribute("data-param", "1")
  };
</script>

Preparation code output

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var param = div.getAttribute("data-param");
div.setAttribute("data-param", param + 1);

var param = div.dataset.param;
div.dataset.param = param + 1;

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