Get cursor or text position in pixels for input element

IE allows me to create a text range in an input element, upon which I can call getBoundingClientRect() and get the position in pixels of a certain character or the cursor/caret. Is there any way of getting the position of a certain character in pixels in other browsers?

var input = $("#myInput")[0];
var pixelPosition = null;
if (input.createTextRange)
{
    var range = input.createTextRange();
    range.moveStart("character", 6);
    pixelPosition = range.getBoundingClientRect();
}
else
{
    // Is there any way to create a range on an input's value?
}

I'm using jQuery, but I doubt it will be able to address my situation. I expect a pure JavaScript solution, if any, but jQuery answers are welcome.