<!DOCTYPE html>
<html>
<body>
<div tabindex=0></div>
<input id="input" type="text">
<input id="readonly" type="text" readonly>
<script>

document.querySelector('div').focus();

function focusTextField(id)
{
    document.getElementById(id).focus();
}

function blurTextField(id)
{
    document.getElementById(id).blur();
}

function removeTextField(id)
{
    document.getElementById(id).remove();
}

</script>
</body>
</html>