pad : float, default: 0.4
            Padding around the child objects, in fraction of the font size.
        borderpad : float, default: 0.5
            Border padding, in fraction of the font size.
        prop : `~matplotlib.font_manager.FontProperties`, optional
            Font property used as a reference for paddings.
        frameon : bool, default: True
            If True, draw a box around this artist.
        **kwargs
            Keyword arguments forwarded to `.AnchoredOffsetbox`.

        Attributes
        ----------
        drawing_area : `~matplotlib.offsetbox.AuxTransformBox`
            A container for artists to display.

        Examples
        --------
        To display an ellipse in the upper left, with a width of 0.1 and
        height of 0.4 in data coordinates:

        >>> box = AnchoredAuxTransformBox(ax.transData, loc='upper left')
        >>> el = Ellipse((0, 0), width=0.1, height=0.4, angle=30)
        >>> box.drawing_area.add_artist(el)
        >>> ax.add_artist(box)
        r