As mentioned, the table based layout vanishes and is replaced by css styling with boxes (regard: a css box has nothing to do with a pWS box, there is the same word "box" in the logic of css and there is a meaning for "box" more in the pWS 0.x.x logic). To confuse a bit, a pWSbox may be used in pWS 1.x.x also, that works with CSSboxes. Let use these two unique terms to differ.
CSSboxes are formed by div containers. A plenty of properties (like dimensions, borders etc) may be assigned to. Let have a look to the shellow drawn scheme of pWS 1.x.x