AutoPlacementOptions  
    Properties
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                  Which placements are allowed to be chosen. Placements must be within the alignment option if explicitly set.
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                  Whether to check for overflow using the alternate element's boundary (clippingAncestors boundary only).
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                  Whether to choose placements with the opposite alignment if the preferred alignment does not fit.
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                  The element in which overflow is being checked relative to a boundary.
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                  The root clipping area in which overflow will be checked.