Font and font size unit for Smartphones

Question

Which font and which font-size unit is recomended for developing web sites for smartphones? With smartphone I mean a device with a good web browser.

I am not sure to go with px, em or %

Thanks for sugestions and tips.

regards bob

Answer 1

I would use the CSS medium, large, small, x-large, etc... since the browser will know the user's preference and won't be limited to a fixed size.