input element - absolute positioning - determing width with left and right

<input type="text" style="position: absolute; left: 0; right: 0;">

How should that be rendered?

Firefox uses left and right to determine the width of the input or
textarea. In Opera and IE, left and right have no effect on the width
of form elements.

Now, if it's a div, Opera will use left and right. It's just with form
elements AFAIK.

-- 
burnout426