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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
  <button>Open tab</button>
</body>
</html>
 
var new_win;
document.querySelector('button').onclick = function(){
  if (new_win) {
    new_win.focus();
  }
  else {
    new_win = window.open('tutabi');
  }
};
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moshfeupro
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