JavaScript form validation

<!DOCTYPE html>
<html>
<head>
<script>
function validateForm() {
    var x = document.forms["myForm"]["fname"].value;
    if (x == null || x == "") {
        alert("Name must be filled out");
        return false;
    }
}
</script>
</head>
<body>

<form onsubmit="return validateForm()">
Name: <input type="text" name="fname">
<input type="submit" value="Submit">
</form>

</body>
</html>

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