code: function _createMaskOpening() {
    const element = document.createElementNS(svgNS, 'rect');
  
    _setAttributes(element, {
      fill: '#000000',
      id: elementIds.modalOverlayMaskOpening
    });
  
    return element;
  }
docs: <rect id="shepherdModalMaskOpening" fill="#000000"/>