How do you share information on a grid with a designer / design process, such that it helps in further coding of CSS of a responsive interface?
Do you use any tools in a mock? Do you show blueprints of columns? Do you provide certain settings in a PSD?
EDIT: Maybe a bit more concrete example of the design of a responsive header can help:
Assuming we want to design a responsive header for a web page. With Photoshop, a designer would chose fonts, add spacings, borders, etc. Now, when the design goes to a frontend designer, how does a frontend developer know about choosing grid settings? Or, how could a frontend designer communicate her choice for a grid to a designer? E.g what would be the use for a designer of a grid styleguide, e.g. like the Boostrap grid: http://twitter.github.io/bootstrap/scaffolding.html#gridSystem