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<!DOCTYPE html>
<html>
<body>
<head>
  <meta name="description" content="Free Web tutorials">
  <meta name="keywords" content="HTML5,CSS,JavaScript">
  <meta name="author" content="John Doe">
</head>
<p>Click the button to return the value of the name attribute of all meta elements.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementsByTagName("META");
  var txt = "";
  var i;
  for (i = 0; i <x.length; i++) {
    txt = txt + "Name of "+(i+1)+". meta tag: "+x[i].name+"<br>";
  }
  
  document.getElementById("demo").innerHTML = txt;
}
</script>
</body>
</html>