HTML: Sub-pixel border

Question

Is it possible to have a border that is thinner than 1px and works in IE6+ and is not an image and renders properly visually?

Thank you.

Answer 1

I think you could define the width of a border using units like em which would come out to less than 1px, and it would be valid. However, like Will Martin said, for display purposes it would just round it up or down to a whole pixel.