(function(){ var root=document.documentElement; try{ if(window.matchMedia&&window.matchMedia('(prefers-reduced-motion: reduce)').matches)return; if(!('IntersectionObserver' in window))return; root.classList.add('js-motion'); var seen=new WeakSet(); var pending=0; var reveal=function(el){ if(el.classList.contains('is-in'))return; el.classList.add('is-in'); if(pending>0)pending--; if(pending<=0)unbindScroll(); }; var hit=function(entries,obs){ for(var i=0;i=0.6||shown>=vh*0.6; }; var ioLate=new IntersectionObserver(function(entries,obs){ var vh=window.innerHeight; for(var i=0;i0)bindScroll(); }; /* A late group is SUPPOSED to sit unrevealed while it is partly on screen, so neither the sweep nor the guard may touch it until it is fully in view. Without this the safety nets would read a deliberate pause as a stuck reveal and, in the guard's case, switch off every animation on the site. */ var waiting=function(el,r,vh){ return el.hasAttribute('data-reveal-late')&&!enough(r,vh); }; var sweep=function(){ var stuck=document.querySelectorAll('.reveal:not(.is-in)'); var vh=window.innerHeight; for(var i=0;i0)reveal(stuck[i]); } }; /* The scroll listener re-arms the guard and it must cost NOTHING per event. The first version of this ran a document-wide querySelector for unrevealed blocks on every scroll event: 33 microseconds a call once everything had been revealed, because the query then has to walk the whole document to return null, so it got MORE expensive the further down the page you were. It was measured at 0.15 to 0.48ms per event on a desktop, several times that on a mid-range phone and it never stopped, on every page of the site. Now the count of unrevealed blocks is kept as a number, the handler is an integer comparison and the listener takes itself off entirely once there is nothing left to reveal. */ var scrollBound=false; var onScroll=function(){ if(pending<=0){unbindScroll();return;} guard(); }; function bindScroll(){ if(scrollBound)return; scrollBound=true; window.addEventListener('scroll',onScroll,{passive:true}); } function unbindScroll(){ if(!scrollBound)return; scrollBound=false; window.removeEventListener('scroll',onScroll); } var guardPending=false; var guard=function(){ if(guardPending)return; guardPending=true; setTimeout(function(){ guardPending=false; var stuck=document.querySelectorAll('.reveal:not(.is-in)'); if(!stuck.length)return; var vh=window.innerHeight; if(vh<=0){root.classList.remove('js-motion');pending=0;unbindScroll();return;} for(var i=0;i0){root.classList.remove('js-motion');pending=0;unbindScroll();return;} } },4000); }; var queued=false; var queue=function(){ if(queued)return; queued=true; setTimeout(function(){queued=false;scan();setTimeout(sweep,1200);guard();},0); }; scan(); if(document.readyState==='loading')document.addEventListener('DOMContentLoaded',scan); new MutationObserver(queue).observe(root,{childList:true,subtree:true}); window.addEventListener('load',function(){setTimeout(sweep,1200);guard();}); guard(); window.addEventListener('pageshow',queue); document.addEventListener('visibilitychange',function(){if(!document.hidden)queue();}); }catch(e){root.classList.remove('js-motion');} })();

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