(()=>{"use strict";"undefined"!=typeof window&&(window.pmcDomUtils={isElementVisible:function(e){if(!e)return!1;var t=e,n=t.offsetHeight,i=t.getBoundingClientRect(),r=i.height/2+i.top;return n>0&&r>=0&&r<=window.innerHeight},isMiddleChild:function(e){if(!e||!e.parentElement)return!1;var t=Array.from(e.parentElement.children).filter(function(t){return t.tagName===e.tagName});if(t.length<3)return!1;var n=Math.round(t.length/2);return e===t[n]}})})();