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Above the reference element.
Above and aligned to the left of the reference element.
Above and aligned to the right of the reference element.
Below the reference element.
Below and aligned to the left of the reference element.
Below and aligned to the right of the reference element.
To the left of the reference element.
To the left and aligned to the bottom of the reference element.
To the left and aligned to the top of the reference element.
To the right of the reference element.
To the right and aligned to the bottom of the reference element.
To the right and aligned to the top of the reference element.
Represents the position of a popup element with respect to a reference element.