Thanks! I won't be including pixel grids at all, but the width preview tool has some standard breakpoints baked in. I feel strongly that 960, etc are fictions

Thanks! I won't be including pixel grids at all, but the width preview tool has some standard breakpoints baked in. I feel strongly that 960, etc are fictions created by web designers and in reality we don't have the luxury of assuming fixed widths on the web.