layout - use vertical percentage for css - height: x%; -

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i trying make fluid layout app , having trouble using css height percentages. using horizontal size of window specify height % when want getting percentage vertical size of window. possible or out of luck?

width: x%; height: y%;

x , y being percentage want element be. both being determined horizontal size of window, , want each use it's respective axis.

if use javascript update absolute height of parent node, height % begins mean something. playing around, p or div first generation child of body ignores css height%; wrap in absolute height. if don't know height before hand, use onload js function set it.


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