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SBT is quite right. We would like "height: 100%" to mean the whole screen height, but that's often not the case, although in some situations/readers it might work.
From my spec readings and research, the best I can say is that "height: 100%" is undefined (unless you have a containing block with some fixed height). Note, also, that percentage in vertical margins are interpreted in terms of the width, so it's sometimes not as easy as it would seem (but it means in this case that a margin of 5% is the same size in all four sides).
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