gistfile1.html

<script>
    (function() {
      var searches = document.location.search.substr(1).split('&');
      
      var searchesLength = searches.length;
      var item, elements, elementsLength, ele, normalisedTagName;
          
      while (searchesLength--) {
        item = searches[searchesLength].split('=');
        
        elements = document.getElementsByName(decodeURIComponent(item[0]));
        elementsLength = elements.length;
        
        while (elementsLength--) {
          ele = elements[elementsLength];
          normalisedTagName = ele.tagName.toLowerCase();
          
          if (normalisedTagName === 'input' || normalisedTagName === 'textarea') {
            ele.value = decodeURIComponent(item[1]);
          }
        }
      }
    }());
</script>