No input text value via JavaScript DOM

Question

I use JavaScript to create input text fields. And everything works fine, except attribute value. It simply doesn't generate and I don't know why?

Here's my code:

k=1;
function addtxt() {
    var tip = document.createElement("input");
    tip.type = "text";
    tip.name = "tip[" + k + "]";
    tip.value = "Question1";
    var div = document.createElement("div");
    div.innerHTML = "Question: " + tip.outerHTML + "<br />";
    document.getElementById("mydiv").appendChild(div);
k++
}

This is what I got:

<input type="text" name="tip[1]">

Answer 1

may be try using setAttribute(), like, change:

tip.value = "Question1";

to

tip.setAttribute('value', "Question1");