Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<h1>JavaScript Variables</h1>

<p>Add "John" + " " + "Doe":</p>

<p id="demo"></p>

<script>
var x = "John" + " " + "Doe";
document.getElementById("demo").innerHTML = x;
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript Variables</h1>

<p>Add "John" + " " + "Doe":</p>

<p id="demo"></p>

<script>
var x = "John" + " " + "Doe";
document.getElementById("demo").innerHTML = x;
</script>

</body>
</html>