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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Example</title>
</head>
<body>
<script>
  (function() {
    "use strict";
    
    var elm = document.createElement('a');
    elm.style.foobar = "test";
    document.body.appendChild(elm);
    
    var elms = document.querySelectorAll('a');
    display(elms[0].style.foobar);
    
    function display(msg) {
      var p = document.createElement('p');
      p.innerHTML = String(msg);
      document.body.appendChild(p);
    }
  })();
</script>
</body>
</html>
Output

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