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(function () { 'use strict'; var BUFFER = 1.5; function processImages() { var images = document.querySelectorAll( 'img:not([data-xtreme-lazy-checked])' ); images.forEach(function (img) { img.setAttribute('data-xtreme-lazy-checked', 'true'); var rect = img.getBoundingClientRect(); if (rect.top <= window.innerHeight * BUFFER) { return; } if (!img.hasAttribute('loading')) { img.setAttribute('loading', 'lazy'); } if (!img.hasAttribute('fetchpriority')) { img.setAttribute('fetchpriority', 'low'); } }); } function processIframes() { document.querySelectorAll( 'iframe:not([data-xtreme-lazy-checked])' ).forEach(function (iframe) { iframe.setAttribute( 'data-xtreme-lazy-checked', 'true' ); var rect = iframe.getBoundingClientRect(); if (rect.top <= window.innerHeight * BUFFER) { return; } iframe.setAttribute('loading', 'lazy'); }); } function processPage() { processImages(); processIframes(); } if (document.readyState === 'loading') { document.addEventListener( 'DOMContentLoaded', processPage ); } else { processPage(); } var observer = new MutationObserver(function (mutations) { var changed = false; mutations.forEach(function (mutation) { if (mutation.addedNodes.length) { changed = true; } }); if (changed) { processPage(); } }); if (document.body) { observer.observe(document.body, { childList: true, subtree: true }); } })();