The W3C CSS working group has posted a working draft of the Flexible Box Layout Module. "The draft describes a CSS box model optimized for interface design. It provides an additional layout system alongside the ones already in CSS. [CSS21] In this new box model, the children of a box are laid out either horizontally or vertically, and unused space can be assigned to a particular child or distributed among the children by assignment of “flex” to the children that should expand. Nesting of these boxes (horizontal inside vertical, or vertical inside horizontal) can be used to build layouts in two dimensions. This model is based on the box model in the XUL user-interface language used for the user interface of many Mozilla-based applications (such as Firefox)." New properties introduced in this draft include:
box-alignbox-directionbox-flexbox-flex-groupbox-linesbox-ordinal-groupbox-orientbox-pack
