浮动div中浮动div的跨浏览器大小调整

I'd like to get the following sizing behavior on a row of data. The 'abcd...' field is a variable size, and I'd like as much of it displayed as possible after all the other fields have taken up their required space. The '0123...' field is a variable size, and I'd like fully displayed right after the first field. The 'X' field is a known fixed size, and I'd like it pinned to the right side.I'd like to get the following sizing behavior o