Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function getDiv(){
      return document.createElement('div');
    };
    
    function decodeHTML(input){
      var e = getDiv().cloneNode(false);
      e.innerHTML = input;
      return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
    };
    
    function decodeHTML2(input){
      var e = document.createElement('div');
      e.innerHTML = input;
      return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue;
    };
    
    var unique = document.createElement('div');
    function decodeHTML3(input){
      unique.innerHTML = input;
      return unique.childNodes.length === 0 ? "" : unique.childNodes[0].nodeValue;
    };
  };
</script>

Test runner

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decodeHTML("<img src='myimage.jpg'>");

decodeHTML2("<img src='myimage.jpg'>");

decodeHTML3("<img src='myimage.jpg'>");

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