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Encapsulates a popup position where the popup is anchored at a corner of
an element. The corners are swapped if dictated by the viewport. For instance
if a popup is anchored with its top left corner to the bottom left corner of
the anchor the popup is either displayed below the anchor (as specified) or
above it if there's not enough room to display it below.
When using this positioning object it's recommended that the movable element
be absolutely positioned.
new AnchoredViewportPosition( anchorElement, corner, opt_adjust, opt_overflowConstraint )
| Parameters | | anchorElement | (Element|null) | | Element the movable element should be
anchored against.
| | corner | goog.positioning.Corner | | Corner of anchored element the
movable element should be positioned at.
| | opt_adjust | boolean= | | Whether the positioning should be adjusted until
the element fits inside the viewport even if that means that the anchored
corners are ignored.
| | opt_overflowConstraint | (goog.math.Box|null)= | | Box object describing the
dimensions in which the movable element could be shown.
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