Don't wrap the overridden element with a container

[stuckj]

The current code is wrapping the original input and the generated input
with a container span. The wrapper causes problems with inputs that
use :focus to, e.g., change the underline border color or animate moving
placeholder text via CSS. This can only be done with javascript without
having the input as a sibling except in the trivial case where there is only
one input on the page.

[mydea]

I'm not quite sure what problem that solves.

Currently, you'd get a markup like:

<label>
<div wrapper>
  <input hidden>
  <input display>
</div>

What prevents you from using focus here? I am sure that there are also scenarios where this would lead to an issue:

<label>
<input hidden>
<input display>