What are cons to use Grid based approach? Where everything is in proportions?
Does it all make some restrictness? I'm not talking about non-sematic classes, unneeded css code, table- feel structure.
My question is about to work with fix proportions. in grid based system everything increase and decrease in proportions?
I think we can only use grid based framework if we are doing both thing PSD design and XHTML css coding?
If you are not designing the site, I highly suggest not using a grid or any other tools that would alter the design (proportionately or otherwise). Leave the design to the designer, and handle development, trying to get your finished design as close as possible to the finished mockup from the designer.
Nother irritates me more than when I have handed off a design to a developer, and he "adjusts" it because of some improvement he thought relevant.
If your designer doesn't use a grid, talk to him about it. If he prefers to continue without a grid, then don't force a grid on his design.
Grids don't increase/decrease things proportionally. They merely allow you to layout things in a nice and orderly fashion. I can't think of any cons to grid-based CSS frameworks. Perhaps they are overkill for some projects, but other than that they are terrific and should be favored by veteran designers.