code: function positionModalOpening(targetElement, openingElement) {
    if (targetElement.getBoundingClientRect && openingElement instanceof SVGElement) {
      const { x, y, width, height, left, top } = targetElement.getBoundingClientRect();
  
      // getBoundingClientRect is not consistent. Some browsers use x and y, while others use left and top
      _setAttributes(openingElement, { x: x || left, y: y || top, width, height });
    }
  }
docs: Uses the bounds of the element we want the opening overtop of to set the dimensions of the opening and position it
  @param {HTMLElement} targetElement The element the opening will expose
  @param {SVGElement} openingElement The svg mask for the opening