yes but you will have troubles applying this with valid XHTML and that onle applies to the body and one div.Test it this way. Place 2 divs in your body,one on top of the other, each with a colored border so you can see them. Make the top div width:500px;height:250px. then make the bottom one width:500px and height:100%.The bottom one will not, in FF, take up the remaining space of the screen but will be the total height of the screen + 250px of the top div.