result = getComputedStyle(p, null, propidx);
sm.putParentRelative(propidx, true);
sm.putInherited (propidx, true);
} else {
// Maybe is it a relative value.
result = vm.computeValue(elt, pseudo, this, propidx,
sm, result);
}
if (value == null) {
sm.putValue(propidx, result);
sm.putNullCascaded(propidx, true);