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You have a syntax error.

You want it to say, "use strict" not "user strict".

You also want to put "use strict" at the top of your file.

I've attached what I think you should change your code to.

"use strict";

function validateFields() {
    var nameserverone = document.getElementById("ns1").value;
    var nameservertwo = document.getElementById("ns2").value;

    if (nameserverone === null) {
        console.log("say Hi");
        return nameserverone;
    }
    else {
        console.log("Say Bye");
    }
}

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