Absolute location layout with a container height of 100% _ CSS/HTML

Container height 100% absolute positioning layout container height 100% is frequently used, any container can be implemented, and no nested relationship is required. Think of the body as a container and set its height to 100% as the upper-layer label of the internal object. Basic example
* {Margin: 0; padding: 0; border: 0 ;}
Html, body {height: 100%;}/* both set html to be compatible with FF */
# Box_2 {height: 100%; background: #000 ;}
Overlapping positioning Effect
# Box_1 {position: absolute; top: 0; left: 0; width: 100%; height: 50px; background: # f00; z-index: 2 ;}
# Box_2 {position: absolute; left: 0; top: 0; width: 100%; height: 100%; background: #000; z-index: 1 ;}
Vertical and relative height
# Box_1 {position: absolute; top: 0; left: 0; width: 100%; height: 30%; background: # f00; z-index: 2 ;}
# Box_2 {position: absolute; left: 0; top: 30%; width: 100%; height: 70%; background: #000; z-index: 1 ;}
Horizontal relative width
# Box_1 {position: absolute; top: 0; left: 0; width: 30%; height: 100%; background: # f00; z-index: 2 ;}
# Box_2 {position: absolute; top: 0; right: 0; width: 70%; height: 100%; background: #000; z-index: 1 ;}
This layout does not require float, and there are many changes: 1, N Column Layout
2, N rows Layout
3. N columns and N rows of cross layout. It is worth noting that when you browse the container page of the relative size under FF, the container size is adjusted while the window size is adjusted in real time, however, IE only works after the window is adjusted. IE5.0/IE5.5/IE6.0 and FF1.5 passed the test.