Tryit Editor v2.9

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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 content 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 + "Content of "+(i+1)+". meta tag: "+x[i].content+"<br>";
    }
    
    document.getElementById("demo").innerHTML = txt;
}
</script>

</body>
</html>