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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <input type="button" value="Vyber náhodného človeka!" id="tlacitko"><br>
  <i>Rozdeľovací znak(y): </i>
  <input type="text" 
         value="," 
         size="1" 
         id="rozdelovaci_text">
  <hr>
  <div id="clovek"></div>
  <textarea>Jana,Alena,Boris</textarea>
</body>
</html>
 
textarea,input[type="button"] {
  margin:1% 0;
}
textarea {
  display:block;
  min-width:100%;
  max-width:100%;
  height:200px;
}
​
body {padding:1vh 1vw;}
 
function sel(str){return document.querySelector(str);}
tlacitko.addEventListener("click", function() {
  var text = sel("textarea"),
      ludia = text.value.split(rozdelovaci_text.value),
      rand = Math.floor(Math.random()*ludia.length);
  clovek.innerHTML = "Náhodný človek: "+ludia[rand];
},true);
Output 300px

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