getBoundingRect() {
        return {
            width: this._boundingRect.document.width,
            height: this._boundingRect.document.height,
            top: this._boundingRect.document.top,
            left: this._boundingRect.document.left,

            // right = left + width, bottom = top + height
            right: this._boundingRect.document.left + this._boundingRect.document.width,
            bottom: this._boundingRect.document.top + this._boundingRect.document.height,
        };
    }
Useful to get our plane HTML element bounding rectangle without triggering a reflow/layout

     returns :
     @boundingRectangle (obj): an object containing our plane HTML element bounding rectangle (width, height, top, bottom, right and left properties)
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