JavaScript
/* Lazy Load XT 1.0.2 | MIT License */
!function(a,b,c,d){function e(a,b){return a[b]===d?s[b]:a[b]}function f(a,b){var c=s["on"+a];c&&(v(c)?c.call(b[0]):b.addClass(c.addClass||"").removeClass(c.removeClass||"")),b.trigger("lazy"+a,[b]),j()}function g(b){f(b.type,a(this).off(o,g))}function h(c){if(y.length){c=c||s.forceLoad,z=1/0;var d,e,h=u.scrollTop(),i=b.innerHeight||u.height(),j=b.innerWidth||u.width();for(d=0,e=y.length;e>d;d++){var k,l=y[d],n=l[0],p=l[m],r=!1,t=c;if(a.contains(q,n)){if(c||!p.visibleOnly||n.offsetWidth||n.offsetHeight){if(!t){var w=n.getBoundingClientRect(),x=p.edgeX,A=p.edgeY;k=w.top+h-A-i,t=h>=k&&w.bottom>-A&&w.left<=j+x&&w.right>-x}if(t){f("show",l);var B=p.srcAttr,C=v(B)?B(l):n.getAttribute(B);C&&(l.on(o,g),n.src=C),r=!0}else z>k&&(z=k)}}else r=!0;r&&(y.splice(d--,1),e--)}e||f("complete",a(q))}}function i(){A>1?(A=1,h(),setTimeout(i,s.throttle)):A=0}function j(a){y.length&&(a&&"scroll"===a.type&&a.currentTarget===b&&z>=u.scrollTop()||(A||setTimeout(i,0),A=2))}function k(){u.lazyLoadXT()}function l(){h(!0)}var m="lazyLoadXT",n="lazied",o="load error",p="lazy-hidden",q=c.documentElement||c.body,r=b.onscroll===d||!!b.operamini||!q.getBoundingClientRect,s={autoInit:!0,selector:"img[data-src]",blankImage:"data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",throttle:99,forceLoad:r,loadEvent:"pageshow",updateEvent:"load orientationchange resize scroll touchmove",forceEvent:"",oninit:{removeClass:"lazy"},onshow:{addClass:p},onload:{removeClass:p,addClass:"lazy-loaded"},onerror:{removeClass:p},checkDuplicates:!0},t={srcAttr:"data-src",edgeX:0,edgeY:0,visibleOnly:!0},u=a(b),v=a.isFunction,w=a.extend,x=a.data||function(b,c){return a(b).data(c)},y=[],z=0,A=0;a[m]=w(s,t,a[m]),a.fn[m]=function(c){c=c||{};var d,g=e(c,"blankImage"),h=e(c,"checkDuplicates"),i=e(c,"scrollContainer"),k={};a(i).on("scroll",j);for(d in t)k[d]=e(c,d);return this.each(function(){if(this===b)a(s.selector).lazyLoadXT(c);else{if(h&&x(this,n))return;var...